126-486: The Alpha Magnetic Spectrometer ( AMS-02 ) is a particle physics experiment module that is mounted on the International Space Station (ISS). The experiment is a recognized CERN experiment (RE1). The module is a detector that measures antimatter in cosmic rays ; this information is needed to understand the formation of the universe and search for evidence of dark matter . The principal investigator
252-487: A Hilbert space , which is also treated in quantum field theory . Following the convention of particle physicists, the term elementary particles is applied to those particles that are, according to current understanding, presumed to be indivisible and not composed of other particles. Ordinary matter is made from first- generation quarks ( up , down ) and leptons ( electron , electron neutrino ). Collectively, quarks and leptons are called fermions , because they have
378-402: A microsecond . They occur after collisions between particles made of quarks, such as fast-moving protons and neutrons in cosmic rays . Mesons are also produced in cyclotrons or other particle accelerators . Particles have corresponding antiparticles with the same mass but with opposite electric charges . For example, the antiparticle of the electron is the positron . The electron has
504-498: A quantum spin of half-integers (−1/2, 1/2, 3/2, etc.). This causes the fermions to obey the Pauli exclusion principle , where no two particles may occupy the same quantum state . Quarks have fractional elementary electric charge (−1/3 or 2/3) and leptons have whole-numbered electric charge (0 or 1). Quarks also have color charge , which is labeled arbitrarily with no correlation to actual light color as red, green and blue. Because
630-1055: A " Theory of Everything ", or "TOE". There are also other areas of work in theoretical particle physics ranging from particle cosmology to loop quantum gravity . In principle, all physics (and practical applications developed therefrom) can be derived from the study of fundamental particles. In practice, even if "particle physics" is taken to mean only "high-energy atom smashers", many technologies have been developed during these pioneering investigations that later find wide uses in society. Particle accelerators are used to produce medical isotopes for research and treatment (for example, isotopes used in PET imaging ), or used directly in external beam radiotherapy . The development of superconductors has been pushed forward by their use in particle physics. The World Wide Web and touchscreen technology were initially developed at CERN . Additional applications are found in medicine, national security, industry, computing, science, and workforce development, illustrating
756-417: A 4.5 km-long (2.8 mi) border with the rest of Switzerland. Of 107.5 km (66.8 mi) of the border, 103 are shared with France, the department of Ain to the north and west and the department of Haute-Savoie to the south and east. Of the land in the city, 0.24 km (0.093 sq mi), or 1.5%, is used for agricultural purposes, while 0.5 km (0.19 sq mi), or 3.1%,
882-526: A child or children. There were 1,852 households that were made up of unrelated people and 3,038 households that were made up of some sort of institution or another collective housing. In 2000 , there were 743 single family homes (or 10.6% of the total) out of a total of 6,990 inhabited buildings. There were 2,758 multi-family buildings (39.5%), along with 2,886 multi-purpose buildings that were mostly used for housing (41.3%) and 603 other use buildings (commercial or industrial) that also had some housing (8.6%). Of
1008-449: A clean cut for each existing stainless steel tube connected to the AMS, then connecting it to the new system through swaging . The astronauts also completed an additional task to install an insulating blanket on the nadir side of the AMS to replace the heat shield and blanket they removed during the first spacewalk to begin the repair work. The flight control team on Earth initiated power-up of
1134-454: A favourable Franco-Swiss tax regime for French residents working in Switzerland. The official language of Geneva (both the city and the canton) is French . English is also common due to a high number of Anglophone residents working in international institutions and the bank sector. In 2000 there were 128,622 residents, or 72.3% of the population, who spoke French as a first language. English
1260-452: A fourth generation of fermions does not exist. Bosons are the mediators or carriers of fundamental interactions, such as electromagnetism , the weak interaction , and the strong interaction . Electromagnetism is mediated by the photon , the quanta of light . The weak interaction is mediated by the W and Z bosons . The strong interaction is mediated by the gluon , which can link quarks together to form composite particles. Due to
1386-502: A halo around the nearby pulsar Geminga . The accelerated electrons and positrons collide with nearby starlight. The collision boosts the light to much higher energies. Geminga alone could be responsible for as much as 20% of the high-energy positrons seen by the AMS-02 experiment. The AMS-02 on the ISS has, as of 2021, recorded eight events that seem to indicate the detection of antihelium-3. Over
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#17328481465671512-939: A long and growing list of beneficial practical applications with contributions from particle physics. Major efforts to look for physics beyond the Standard Model include the Future Circular Collider proposed for CERN and the Particle Physics Project Prioritization Panel (P5) in the US that will update the 2014 P5 study that recommended the Deep Underground Neutrino Experiment , among other experiments. Geneva, Switzerland Geneva ( / dʒ ə ˈ n iː v ə / jə- NEE -və ; Arpitan : [dzəˈnɛva] ; French: Genève [ʒənɛv] )
1638-511: A long evolutionary process has been called "the most sophisticated particle detector ever sent into space", rivaling very large detectors used at major particle accelerators , and has cost four times as much as any of its ground-based counterparts. Its goals have also evolved and been refined over time. As built it is a more comprehensive detector which has a better chance of discovering evidence of dark matter along with other goals. The power requirements for AMS-02 were thought to be too great for
1764-509: A lowest price per square metre (11 sq ft) of 4,874 Swiss francs (CHF), and a maximum price of 21,966 Swiss francs (CHF). William Monter calculates that the city's total population was 12,000–13,000 in 1550, doubling to over 25,000 by 1560. The historical population is given in the following chart: The 2000 census recorded 66,491 residents (37.4% of the population) as Catholic, while 41,289 people (23.20%) belonged to no church or were agnostic or atheist , 24,105 (13.5%) belonged to
1890-686: A member of the Municipal Council. The Council holds its meetings in the Town Hall ( Hôtel de Ville ), in the old city. The last election of the Municipal Council was held on 15 March 2020 for the term 2020–2025. Currently, the Municipal Council consists of: 19 members of the Social Democratic Party (PS), 18 Green Party (PES), 14 Les Libéraux-Radicaux (PLR), 8 Christian Democratic People's Party ; (PDC) 7 Geneva Citizens' Movement (MCG), 7 Ensemble à Gauche (an alliance of
2016-430: A negative electric charge, the positron has a positive charge. These antiparticles can theoretically form a corresponding form of matter called antimatter . Some particles, such as the photon , are their own antiparticle. These elementary particles are excitations of the quantum fields that also govern their interactions. The dominant theory explaining these fundamental particles and fields, along with their dynamics,
2142-461: A one-room apartment was 641.60 CHF (US$ 510, £290, €410), a two-room apartment was about 874.46 CHF (US$ 700, £390, €560), a three-room apartment was about 1126.37 CHF (US$ 900, £510, €720) and a six or more room apartment cost an average of 2691.07 CHF (US$ 2150, £1210, €1720). The average apartment price in Geneva was 104.2% of the national average of 1116 CHF. The vacancy rate for the municipality, in 2010 ,
2268-500: A population of 1,046,168 in Jan. 2021 (Swiss estimates and French census), 58.3% of them living on Swiss territory, and 41.7% on French territory. Geneva does not have any sister relationships with other cities. It declares itself related to the entire world. The city of Geneva ( ville de Genève ) had a population 203,856 in 2021 (Jan. estimate) within its small municipal territory of 16 km (6 sq mi). The city of Geneva
2394-603: A population of 203,856 in January 2021 within its municipal territory of 16 km (6 sq mi). The Geneva metropolitan area as officially defined by Eurostat , including suburbs and exurbs in Vaud and the French departments of Ain and Haute-Savoie , extends over 2,292 km (885 sq mi) and had a population of 1,053,436 in 2021. Since 2013, the Canton of Geneva,
2520-660: A practical independent spacecraft, so AMS-02 was designed to be installed as an external module on the International Space Station and use power from the ISS. The post- Space Shuttle Columbia plan was to deliver AMS-02 to the ISS by space shuttle in 2005 on station assembly mission UF4.1 , but technical difficulties and shuttle scheduling issues added more delays. AMS-02 completed final integration and operational testing at CERN in Geneva, Switzerland which included exposure to energetic proton beams generated by
2646-537: A reevaluation of existing models of the cosmos, as discussed at the APS April meeting in 2024. [REDACTED] This article incorporates public domain material from AMS project page . National Aeronautics and Space Administration . Particle physics Particle physics or high-energy physics is the study of fundamental particles and forces that constitute matter and radiation . The field also studies combinations of elementary particles up to
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#17328481465672772-510: A signal for dark matter, or whether they have some other origin." On September 18, 2014, new results with almost twice as much data were presented in a talk at CERN and published in Physical Review Letters . A new measurement of positron fraction up to 500 GeV was reported, showing that positron fraction peaks at a maximum of about 16% of total electron+positron events, around an energy of 275 ± 32 GeV. At higher energies, up to 500 GeV,
2898-550: A simplified version of the detector, was built by the international consortium under Ting's direction and flown into space aboard the Space Shuttle Discovery on STS-91 in June 1998. By not detecting any antihelium , the AMS-01 established an upper limit of 1.1×10 for the antihelium-to-helium flux ratio and proved that the detector concept worked in space. This shuttle mission was
3024-459: A total of 85,330 apartments (83.8% of the total) were permanently occupied, while 13,644 apartments (13.4%) were seasonally occupied and 2,820 apartments (2.8%) were empty. As of 2009 , the construction rate of new housing units was 1.3 new units per 1000 residents. As of 2003 , the average price to rent an average apartment in Geneva was 1163.30 Swiss francs (CHF) per month (US$ 930, £520, €740 approx. exchange rate from 2003). The average rate for
3150-640: A twelve-year period aboard the ISS, the AMS has accumulated a dataset of more than 230 billion cosmic rays, spanning energies reaching multi-TeV levels. The precise measurements obtained by the magnetic spectrometer enable data presentation with an accuracy approaching ~1%. Particularly significant is the high-energy data regarding elementary particles such as electrons, positrons, protons, and antiprotons, which presents challenges to theoretical frameworks. Additionally, observations of nuclei and isotopes reveal energy dependencies that deviate from theoretical predictions. The extensive dataset collected by AMS necessitates
3276-435: A wide range of exotic particles . All particles and their interactions observed to date can be described almost entirely by the Standard Model. Dynamics of particles are also governed by quantum mechanics ; they exhibit wave–particle duality , displaying particle-like behaviour under certain experimental conditions and wave -like behaviour in others. In more technical terms, they are described by quantum state vectors in
3402-536: Is Nobel laureate particle physicist Samuel Ting . The launch of Space Shuttle Endeavour flight STS-134 carrying AMS-02 took place on May 16, 2011, and the spectrometer was installed on May 19, 2011. By April 15, 2015, AMS-02 had recorded over 60 billion cosmic ray events and 90 billion after five years of operation since its installation in May 2011. In March 2013, Professor Ting reported initial results, saying that AMS had observed over 400,000 positrons , with
3528-425: Is a particle physics theory suggesting that systems with higher energy have a smaller number of dimensions. A third major effort in theoretical particle physics is string theory . String theorists attempt to construct a unified description of quantum mechanics and general relativity by building a theory based on small strings, and branes rather than particles. If the theory is successful, it may be considered
3654-456: Is a significant obstacle to sending humans to Mars . Accurate measurements of the cosmic ray environment are needed to plan appropriate countermeasures. Most cosmic ray studies are done by balloon-borne instruments with flight times that are measured in days; these studies have shown significant variations. AMS-02 operates on the ISS , gathering a large amount of accurate data and allowing measurements of
3780-643: Is at the centre of the Geneva metropolitan area , a Functional Urban Area (as per Eurostat methodology) which extends over Swiss territory (entire Canton of Geneva and part of the canton of Vaud ) and French territory (parts of the departments of Ain and Haute-Savoie ). The Geneva Functional Urban Area covers a land area of 2,292 km (885 sq mi) (24.2% in Switzerland, 75.8% in France) and had 1,053,436 inhabitants in Jan. 2021 (Swiss estimates and French census), 57.8% of them on Swiss territory and 42.2% on French territory. The Geneva metropolitan area
3906-538: Is called the Standard Model . The reconciliation of gravity to the current particle physics theory is not solved; many theories have addressed this problem, such as loop quantum gravity , string theory and supersymmetry theory . Practical particle physics is the study of these particles in radioactive processes and in particle accelerators such as the Large Hadron Collider . Theoretical particle physics
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4032-532: Is explained by the Standard Model , which gained widespread acceptance in the mid-1970s after experimental confirmation of the existence of quarks . It describes the strong , weak , and electromagnetic fundamental interactions , using mediating gauge bosons . The species of gauge bosons are eight gluons , W , W and Z bosons , and the photon . The Standard Model also contains 24 fundamental fermions (12 particles and their associated anti-particles), which are
4158-442: Is forested. The rest of the land, 14.63 km (5.65 sq mi), or 91.8%, is built up (buildings or roads), 0.49 km (0.19 sq mi), or 3.1%, is either rivers or lakes and 0.02 km (4.9 acres), or 0.1%, is wasteland. Of the built-up area, industrial buildings made up 3.4%, housing and buildings made up 46.2% and transportation infrastructure 25.8%, while parks, green belts and sports fields made up 15.7%. Of
4284-591: Is in model building where model builders develop ideas for what physics may lie beyond the Standard Model (at higher energies or smaller distances). This work is often motivated by the hierarchy problem and is constrained by existing experimental data. It may involve work on supersymmetry , alternatives to the Higgs mechanism , extra spatial dimensions (such as the Randall–Sundrum models ), Preon theory, combinations of these, or other ideas. Vanishing-dimensions theory
4410-523: Is made of matter ; however, scientists believe there are about 100–200 billion galaxies in the observable Universe and some versions of the Big Bang theory of the origin of the Universe require equal amounts of matter and antimatter. Theories that explain this apparent asymmetry violate other measurements. Whether or not there is significant antimatter is one of the fundamental questions of the origin and nature of
4536-660: Is made up of the Canton of Geneva , the Nyon District (in the canton of Vaud), and the Pôle métropolitain du Genevois français [ fr ] (literally 'Metropolitan hub of the French Genevan territory'), this last one a federation of eight French intercommunal councils in Ain and Haute-Savoie . The Grand Genève GLCT extends over 1,996 km (771 sq mi) and had
4662-560: Is one of the fastest growing in Europe. Its population rose from 906,603 in Jan. 2010 to 1,053,436 in Jan. 2021, which means the metropolitan area registered a population growth rate of +1.39% per year during those 11 years. Growth is higher in the French part of the metropolitan area (+1.80% per year between 2010 and 2021) than in the Swiss part (+1.10% per year between 2010 and 2021), as Geneva attracts many French commuters due to high Swiss salaries and
4788-519: Is the neutralino . If neutralinos exist, they should be colliding with each other and giving off an excess of charged particles that can be detected by AMS-02. Any peaks in the background positron , antiproton , or gamma ray flux could signal the presence of neutralinos or other dark matter candidates, but would need to be distinguished from poorly known confounding astrophysical signals. Six types of quarks ( up , down , strange , charm , bottom and top ) have been found experimentally; however,
4914-649: Is the second-most populous city in Switzerland (after Zürich ) and the most populous in the French-speaking Romandy . Situated in the southwest of the country, where the Rhône exits Lake Geneva , it is the capital of the Republic and Canton of Geneva , and a centre for international diplomacy . Geneva hosts the highest number of international organizations in the world. The city of Geneva ( Ville de Genève ) had
5040-471: Is the study of these particles in the context of cosmology and quantum theory . The two are closely interrelated: the Higgs boson was postulated by theoretical particle physicists and its presence confirmed by practical experiments. The idea that all matter is fundamentally composed of elementary particles dates from at least the 6th century BC. In the 19th century, John Dalton , through his work on stoichiometry , concluded that each element of nature
5166-600: Is used to extract the parameters of the Standard Model with less uncertainty. This work probes the limits of the Standard Model and therefore expands scientific understanding of nature's building blocks. Those efforts are made challenging by the difficulty of calculating high precision quantities in quantum chromodynamics . Some theorists working in this area use the tools of perturbative quantum field theory and effective field theory , referring to themselves as phenomenologists . Others make use of lattice field theory and call themselves lattice theorists . Another major effort
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5292-665: The Genevois province of Savoy (albeit not extending to the city proper, until the reformation of the seat of the Bishop of Geneva ). Geneva was an Allobrogian border town, fortified against the Helvetii tribe, when the Roman Republic took it in 121 BC. It became Christian under the Late Roman Empire , and acquired its first bishop in the 5th century, having been connected to
5418-527: The Bains des Pâquis . The city, in certain years, receives snow during colder months. The nearby mountains are subject to substantial snowfall and are suitable for skiing. Many world-renowned ski resorts such as Verbier and Crans-Montana are less than three hours away by car. Mont Salève (1,379 m (4,524 ft)), just across the border in France, dominates the southerly view from the city centre, and Mont Blanc ,
5544-686: The Bishopric of Vienne in the 4th. In the Middle Ages , Geneva was ruled by a count under the Holy Roman Empire until the late 14th century, when it was granted a charter giving it a high degree of self-governance. Around this time, the House of Savoy came to at least nominally dominate the city. In the 15th century, an oligarchic republican government emerged with the creation of the Grand Council . In
5670-556: The Canadarm2 robotic arm from inside the Station. The spacewalks were described as the "most challenging since [the last] Hubble repairs ". The entire spacewalk campaign was a central feature of the Disney+ docuseries Among The Stars . The first spacewalk was conducted on November 15, 2019. The spacewalk began with the removal of the debris shield covering AMS, which was jettisoned to burn up in
5796-484: The Global Financial Centres Index , second in Europe behind London. In 2019, Geneva was ranked among the ten most liveable cities in the world by Mercer , alongside Zürich and Basel, as well as the thirteenth most expensive city in the world. In a UBS ranking of global cities in 2018, Geneva was ranked first for gross earnings , second most expensive, and fourth in purchasing power . The city
5922-504: The Green Party (11.4%), the PDC (10.7%), and the solidaritéS (8.8%). In the federal election a total of 36,490 votes were cast, and the voter turnout was 44.1%. The city centre of Geneva is located only 1.9 km (1.2 mi) from the border of France . As a result, the urban area and the metropolitan area largely extend across the border on French territory. Due to the small size of
6048-563: The Kennedy Space Center in Florida , United States, in late May 2010. This was, however, postponed to August 26, as AMS-02 underwent final alignment beam testing at CERN. A cryogenic, superconducting magnet system was initially installed on the AMS-02. When the Obama administration extended International Space Station operations beyond 2015, the decision was made by AMS management to exchange
6174-470: The Nyon District (in the canton of Vaud), and the Pôle métropolitain du Genevois français [ fr ] ( lit. ' Metropolitan hub of the French Genevan territory ' , a federation of eight French intercommunal councils), have formed Grand Genève ("Greater Geneva"), a Local Grouping of Transnational Cooperation [ fr ] ( GLCT in French, a public entity under Swiss law) in charge of organizing cooperation within
6300-659: The PdA / solidaritéS (10%, +1.3), the PDC (5.4%, -5.3), the pvl (5%, +2.9), and MCR (4.9%, -2.7). In the federal election a total of 34,319 votes were cast, and the voter turnout was 39.6%. In the 2015 federal election for the Swiss National Council the most popular party was the PS which received 23.8% of the vote. The next five most popular parties were the PLR (17.6%), the UDC (16.3%),
6426-615: The Swiss Reformed Church , and 8,698 (4.89%) were Muslim . There were also 3,959 members of an Orthodox church (2.22%), 220 individuals (or about 0.12% of the population) who belonged to the Christian Catholic Church of Switzerland , 2,422 (1.36%) who belonged to another Christian church, and 2,601 people (1.46%) who were Jewish. There were 707 individuals who were Buddhist, 474 who were Hindu and 423 who belonged to another church. 26,575 respondents (14.93%) did not answer
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#17328481465676552-544: The atomic nuclei are baryons – the neutron is composed of two down quarks and one up quark, and the proton is composed of two up quarks and one down quark. A baryon is composed of three quarks, and a meson is composed of two quarks (one normal, one anti). Baryons and mesons are collectively called hadrons . Quarks inside hadrons are governed by the strong interaction, thus are subjected to quantum chromodynamics (color charges). The bounded quarks must have their color charge to be neutral, or "white" for analogy with mixing
6678-401: The weak interaction , and the strong interaction . Quarks cannot exist on their own but form hadrons . Hadrons that contain an odd number of quarks are called baryons and those that contain an even number are called mesons . Two baryons, the proton and the neutron , make up most of the mass of ordinary matter. Mesons are unstable and the longest-lived last for only a few hundredths of
6804-544: The 18th century, Geneva had come under the influence of Catholic France, which cultivated the city as its own. France tended to be at odds with the ordinary townsfolk, which inspired the failed Geneva Revolution of 1782 , an attempt to win representation in the government for men of modest means. In 1798, revolutionary France under the Directory annexed Geneva. At the end of the Napoleonic Wars , on 1 June 1814, Geneva
6930-496: The AMS was responding as expected. Ground teams worked to fill the new AMS thermal control system with carbon dioxide , allowed the system to stabilize, and powered on the pumps to verify and optimize their performance. The tracker, one of several detectors on the AMS, began collecting science data again before the end of the week after the spacewalk. The astronauts also completed an additional task to remove degraded lens filters on two high-definition video cameras. The duration of
7056-431: The AMS-02 superconducting magnet for the non-superconducting magnet previously flown on AMS-01. Although the non-superconducting magnet has a weaker field strength , its on-orbit operational time at ISS is expected to be 10 to 18 years versus only three years for the superconducting version. In December 2018, it was announced that funding for the ISS had been extended to 2030. In 1999, after the successful flight of AMS-01,
7182-500: The Administrative Council and the administration. The delegates are selected by means of a system of proportional representation with a seven percent threshold. The sessions of the Municipal Council are public. Unlike members of the Administrative Council, members of the Municipal Council are not politicians by profession, and they are paid a fee based on their attendance. Any resident of Geneva allowed to vote can be elected as
7308-572: The CERN SPS particle accelerator . AMS-02 was then shipped by specialist hauler Archived January 17, 2022, at the Wayback Machine to ESA's European Space Research and Technology Centre (ESTEC) facility in the Netherlands , arriving February 16, 2010. Here it underwent thermal vacuum, electromagnetic compatibility , and electromagnetic interference testing. AMS-02 was scheduled for delivery to
7434-549: The CRFG created in 1973. Finally in 2012 the Projet d’agglomération franco-valdo-genevois was renamed Grand Genève ('Greater Geneva'), and the following year it was transformed into a Local Grouping of Transnational Cooperation [ fr ] ( GLCT ), a public entity under Swiss law, which now serves as the executive body of the Grand Genève . The Grand Genève GLCT
7560-467: The CRFG defined for the first time a planning territory called agglomération franco-valdo-genevoise ('Franco- Vaud -Genevan urban area'). 2001 saw the creation of a Comité stratégique de développement des transports publics régionaux ('Strategic Committee for the Development of Regional Public Transports', DTPR ), a committee which adopted in 2003 a 'Charter for Public Transports', first step in
7686-621: The ISS on an additional shuttle flight in 2010 or 2011. The bill was passed by the full U.S. House of Representatives on June 11, 2008. The bill then went before the Senate Commerce, Science and Transportation Committee where it also passed. It was then amended and passed by the full Senate on September 25, 2008, and was passed again by the House on September 27, 2008. It was signed into law by President George W. Bush on October 15, 2008. The bill authorized NASA to add another space shuttle flight to
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#17328481465677812-619: The Jura main range lies north-westward, the Vuache southward, and the Salève south-eastward. The city covers an area of 15.93 km (6.2 sq mi), while the area of the canton is 282 km (108.9 sq mi), including the two small exclaves of Céligny in Vaud . The part of the lake that is attached to Geneva has an area of 38 km (14.7 sq mi) and is sometimes referred to as petit lac ('small lake'). The canton has only
7938-412: The Municipal Council are carried out by the Administrative Council. Elections for the Administrative Council are held every five years. The current term of office is from 1 June 2020 to 31 May 2025. The delegates take office due to a winner-takes-all election ( French : scrutin majoritaire , Swiss Standard German : Majorzwahl or Majorz ). The mayor and vice change each year, while
8064-408: The Standard Model during the 1970s, physicists clarified the origin of the particle zoo. The large number of particles was explained as combinations of a (relatively) small number of more fundamental particles and framed in the context of quantum field theories . This reclassification marked the beginning of modern particle physics. The current state of the classification of all elementary particles
8190-464: The UN ), Basel ( Bank for International Settlements ), and Strasbourg ( Council of Europe ) as a city which serves as the headquarters of at least one critical international organization without being the capital of a country. The city has been referred to as the world's most compact metropolis and the "Peace Capital". In 2023, Geneva was ranked as the world's tenth most important financial centre by
8316-412: The Universe. Any observations of an antihelium nucleus would provide evidence for the existence of antimatter in space. In 1999, AMS-01 established a new upper limit of 10 for the antihelium/helium flux ratio in the Universe. AMS-02 was designed to search with a sensitivity of 10, an improvement of three orders of magnitude over AMS-01 , sufficient to reach the edge of the expanding Universe and resolve
8442-571: The aforementioned color confinement, gluons are never observed independently. The Higgs boson gives mass to the W and Z bosons via the Higgs mechanism – the gluon and photon are expected to be massless . All bosons have an integer quantum spin (0 and 1) and can have the same quantum state . Most aforementioned particles have corresponding antiparticles , which compose antimatter . Normal particles have positive lepton or baryon number , and antiparticles have these numbers negative. Most properties of corresponding antiparticles and particles are
8568-464: The agricultural land, 0.3% is used for growing crops. Of the water in the municipality, 0.2% is composed of lakes and 2.9% is rivers and streams. The altitude of Geneva is 373.6 m (1,225.7 ft) and corresponds to the altitude of the largest of the Pierres du Niton , two large rocks emerging from the lake which date from the last ice age . This rock was chosen by General Guillaume Henri Dufour as
8694-417: The atmosphere. The next task was to install three handrails in the vicinity of AMS to prepare for the next spacewalks and remove zip ties on the AMS' vertical support strut. This was followed by the "get ahead" tasks: Parmitano removed the screws from a carbon-fibre cover under the insulation and passed the cover to Morgan to jettison. The spacewalkers also removed the vertical support beam cover. The duration of
8820-584: The constituents of all matter . Finally, the Standard Model also predicted the existence of a type of boson known as the Higgs boson . On 4 July 2012, physicists with the Large Hadron Collider at CERN announced they had found a new particle that behaves similarly to what is expected from the Higgs boson. The Standard Model, as currently formulated, has 61 elementary particles. Those elementary particles can combine to form composite particles, accounting for
8946-414: The cross-border metropolitan area of Geneva (in particular metropolitan transports). The Grand Genève GLCT extends over 1,996 km (771 sq mi) and had a population of 1,046,168 in Jan. 2021 (Swiss estimates and French census), 58.3% of them living on Swiss territory, and 41.7% on French territory. Geneva is a global city , a financial centre , and a worldwide centre for diplomacy due to
9072-473: The day. Summers are relatively warm. Precipitation is adequate and is relatively well-distributed throughout the year, although autumn is slightly wetter than other seasons. Ice storms near Lac Léman are normal in the winter: Geneva can be affected by the Bise , a north-easterly wind. This can lead to severe icing in winter. In summer, many people swim in the lake and patronise public beaches such as Genève Plage and
9198-447: The development of nuclear weapons . Throughout the 1950s and 1960s, a bewildering variety of particles was found in collisions of particles from beams of increasingly high energy. It was referred to informally as the " particle zoo ". Important discoveries such as the CP violation by James Cronin and Val Fitch brought new questions to matter-antimatter imbalance . After the formulation of
9324-419: The development of a metropolitan, cross-border commuter rail network (see Léman Express ). In 2004, a public transnational body called Projet d’agglomération franco-valdo-genevois ('Franco-Vaud-Genevan urban area project') was created to serve as the main body of metropolitan cooperation for the planning territory defined in 1997, with more local French councils taking part in this new public body than in
9450-444: The energy range from 0.5 to 350 GeV. The positron fraction (of the total electron plus positron events) steadily increased from energies of 10 to 250 GeV, but the slope decreased by an order of magnitude above 20 GeV, even though the fraction of positrons still increased. There was no fine structure in the positron fraction spectrum, and no anisotropies were observed. The accompanying Physics Viewpoint said that "The first results from
9576-513: The executive government of the city of Geneva and operates as a collegiate authority. It is composed of five councilors ( Conseiller administratif / Conseillère administrative ), each presiding over a department. The president of the executive department acts as mayor ( la maire/le maire ). In the governmental year 2021–2022, the Administrative Council is presided over by Madame la maire de Genève Frédérique Perler . Departmental tasks, coordination measures and implementation of laws decreed by
9702-478: The first experimental deviations from the Standard Model, since neutrinos do not have mass in the Standard Model. Modern particle physics research is focused on subatomic particles , including atomic constituents, such as electrons , protons , and neutrons (protons and neutrons are composite particles called baryons , made of quarks ), that are produced by radioactive and scattering processes; such particles are photons , neutrinos , and muons , as well as
9828-585: The first half of the 16th century, the Protestant Reformation reached the city, causing religious strife, during which Savoy rule was thrown off and Geneva allied itself with the Swiss Confederacy . In 1541, with Protestantism on the rise, John Calvin , the Protestant Reformer and proponent of Calvinism , became the spiritual leader of the city and established the Republic of Geneva . By
9954-514: The five seats and, for the first time in history, a female majority in the election held on 15 March / 5 April 2020. Except for the mayor, all other councillors have been elected for the first time. Le Conseil municipal of Geneva for the mandate period of 2020–2025 The Municipal Council ( French : Conseil municipal ) holds legislative power . It is made up of 80 members, with elections held every five years. The Municipal Council makes regulations and by-laws that are executed by
10080-538: The gravitational interaction, but it has not been detected or completely reconciled with current theories. Many other hypothetical particles have been proposed to address the limitations of the Standard Model. Notably, supersymmetric particles aim to solve the hierarchy problem , axions address the strong CP problem , and various other particles are proposed to explain the origins of dark matter and dark energy . The world's major particle physics laboratories are: Theoretical particle physics attempts to develop
10206-585: The heads of the other departments are assigned by the collegiate. The executive body holds its meetings in the Palais Eynard, near the Parc des Bastions . As of 2020, Geneva's Administrative Council is made up of two representatives each of the Social Democratic Party (PS) and the Green Party (PES), and one member of the Christian Democratic Party (PDC). This gives the left-wing parties four out of
10332-503: The highest of the Alpine range, is visible from most of the city, towering high above Chamonix , which, along with Morzine, Le Grand Bornand, La Clusaz, and resorts of the Grand Massif such as Samoens, Morillon, and Flaine, are the closest French skiing destinations to Geneva. During the years 2000–2009, the mean yearly temperature was 11 °C and the mean number of sunshine-hours per year
10458-424: The hundreds of other species of particles that have been discovered since the 1960s. The Standard Model has been found to agree with almost all the experimental tests conducted to date. However, most particle physicists believe that it is an incomplete description of nature and that a more fundamental theory awaits discovery (See Theory of Everything ). In recent years, measurements of neutrino mass have provided
10584-433: The interactions between the quarks store energy which can convert to other particles when the quarks are far apart enough, quarks cannot be observed independently. This is called color confinement . There are three known generations of quarks (up and down, strange and charm , top and bottom ) and leptons (electron and its neutrino, muon and its neutrino , tau and its neutrino ), with strong indirect evidence that
10710-423: The issue definitively. The visible matter in the Universe, such as stars, adds up to less than 5 percent of the total mass that is known to exist from many other observations. The other 95 percent is dark, either dark matter, which is estimated at 20 percent of the Universe by weight, or dark energy , which makes up the balance. The exact nature of both still is unknown. One of the leading candidates for dark matter
10836-523: The last pump was being operated intermittently. In November 2019, after four years of planning, special tools and equipment were sent to the ISS for in-situ repairs requiring four EVAs . Liquid carbon dioxide coolant was also replenished. The repairs were conducted by the ISS crew of Expedition 61 . The spacewalkers were the expedition commander and ESA astronaut Luca Parmitano , and NASA astronaut Andrew Morgan . Both of them were assisted by NASA astronauts Christina Koch and Jessica Meir who operated
10962-529: The last shuttle flight to the Mir space station . After the flight of the prototype, the group, now labelled the AMS Collaboration , began the development of a full research system designated AMS-02 . This development effort involved the work of 500 scientists from 56 institutions and 16 countries organized under United States Department of Energy (DOE) sponsorship. The instrument which eventually resulted from
11088-406: The left parties PST-POP ( Parti Suisse du Travail – Parti Ouvrier et Populaire ) and solidaritéS ), 6 Swiss People's Party (UDC). In the 2019 federal election for the Swiss National Council the most popular party was the Green Party which received 26% (+14.6) of the vote. The next seven most popular parties were the PS (17.9%, -5.9), PLR (15.1%, -2.4), the UDC (12.6%, -3.7),
11214-610: The long term variation of the cosmic ray flux over a wide energy range, for nuclei from protons to iron . In addition to understanding the radiation protection required for astronauts during interplanetary flight , this data will allow the interstellar propagation and origins of cosmic rays to be identified. By late 2016, it was reported that AMS-02 had observed over 90 billion cosmic rays. In February 2013, Samuel Ting reported that in its first 18 months of operation AMS had recorded 25 billion particle events including nearly eight billion fast electrons and positrons. The AMS paper reported
11340-501: The majority of matter on Earth is made up of only up and down quarks. It is a fundamental question whether there exists stable matter made up of strange quarks in combination with up and down quarks. Particles of such matter are known as strangelets . Strangelets might have extremely large mass and very small charge-to-mass ratios. It would be a totally new form of matter. AMS-02 may determine whether this extraordinary matter exists in our local environment. Cosmic radiation during transit
11466-497: The models, theoretical framework, and mathematical tools to understand current experiments and make predictions for future experiments (see also theoretical physics ). There are several major interrelated efforts being made in theoretical particle physics today. One important branch attempts to better understand the Standard Model and its tests. Theorists make quantitative predictions of observables at collider and astronomical experiments, which along with experimental measurements
11592-496: The municipality of Geneva (16 km (6 sq mi)) and extension of the urban area over an international border, official bodies of transnational cooperation were developed as early as the 1970s to manage the cross-border Greater Geneva area at a metropolitan level. In 1973, a Franco-Swiss agreement created the Comité régional franco-genevois ('Franco-Genevan Regional Committee', CRFG ). In 1997 an 'Urban planning charter' of
11718-498: The municipality, and an average of 1.9 persons per household. There were 44,373 households that consist of only one person and 2,549 households with five or more people. Out of a total of 89,269 households that answered this question, 49.7% were households made up of just one person and there were 471 adults who lived with their parents. Of the rest of the households, there are 17,429 married couples without children, 16,607 married couples with children. There were 5,499 single parents with
11844-483: The photon or gluon, have no antiparticles. Quarks and gluons additionally have color charges, which influences the strong interaction. Quark's color charges are called red, green and blue (though the particle itself have no physical color), and in antiquarks are called antired, antigreen and antiblue. The gluon can have eight color charges , which are the result of quarks' interactions to form composite particles (gauge symmetry SU(3) ). The neutrons and protons in
11970-433: The population has changed at a rate of 7.2%; a rate of 3.4% due to migration and at a rate of 3.4% due to births and deaths. As of 2008 , the gender distribution of the population was 47.8% male and 52.2% female. The population was made up of 46,284 Swiss men (24.2% of the population) and 45,127 (23.6%) non-Swiss men. There were 56,091 Swiss women (29.3%) and 43,735 (22.9%) non-Swiss women. As of 2000 approximately 24.3% of
12096-401: The population of Swiss citizens increased by 33, while the foreign population increased by 619. There were 465 Swiss men and 498 Swiss women who emigrated from Switzerland. At the same time, there were 2933 non-Swiss men and 2662 non-Swiss women who immigrated from another country to Switzerland. The total Swiss population change in 2008 (from all sources, including moves across municipal borders)
12222-511: The population of the municipality were born in Geneva and lived there in 2000 – 43,296. A further 11,757 or 6.6% who were born in the same canton, while 27,359 or 15.4% were born elsewhere in Switzerland, and 77,893 or 43.8% were born outside of Switzerland. In 2008 , there were 1,147 live births to Swiss citizens and 893 births to non-Swiss citizens, and in the same time span there were 1,114 deaths of Swiss citizens and 274 non-Swiss citizen deaths. Ignoring immigration and emigration,
12348-634: The positron to electron fraction increasing from 10 GeV to 250 GeV. (Later results have shown a decrease in positron fraction at energies over about 275 GeV). There was "no significant variation over time, or any preferred incoming direction. These results are consistent with the positrons originating from the annihilation of dark matter particles in space, but not yet sufficiently conclusive to rule out other explanations." The results have been published in Physical Review Letters . Additional data are still being collected. The alpha magnetic spectrometer
12474-473: The positron-electron ratio in the mass range of 0.5 to 350 GeV , providing evidence about the weakly interacting massive particle (WIMP) model of dark matter. On March 30, 2013, the first results from the AMS experiment were announced by the CERN press office. The first physics results were published in Physical Review Letters on April 3, 2013. A total of 6.8×10 positron and electron events were collected in
12600-690: The presence of numerous international organizations , including the headquarters of many agencies of the United Nations and the ICRC and IFRC of the Red Cross . In the aftermath of World War I , it hosted the League of Nations . It was where the Geneva Conventions on humanitarian treatment in war were signed. It shares a unique distinction with municipalities such as New York City ( global headquarters of
12726-426: The primary colors . More exotic hadrons can have other types, arrangement or number of quarks ( tetraquark , pentaquark ). An atom is made from protons, neutrons and electrons. By modifying the particles inside a normal atom, exotic atoms can be formed. A simple example would be the hydrogen-4.1 , which has one of its electrons replaced with a muon. The graviton is a hypothetical particle that can mediate
12852-469: The question. According to 2012 statistics by Swiss Bundesamt für Statistik 49.2% of the population were Christian , (34.2% Catholic , 8.8% Swiss Reformed (organized in the Protestant Church of Geneva ) and 6.2% other Christians, mostly other Protestants ), 38% of Genevans were non-religious , 6.1% were Muslim and 1.6% were Jews. Geneva has historically been considered a Protestant city and
12978-512: The radiation and particles as they pass through. Characteristics are determined only for particles that pass through from top to bottom. Particles that enter the detector at any other angles are rejected. From top to bottom the subsystems are identified as: The AMS-02 uses the unique environment of space to advance knowledge of the Universe and lead to the understanding of its origin by searching for antimatter, dark matter and measuring cosmic rays . Experimental evidence indicates that our galaxy
13104-610: The ratio of positrons to electrons begins to fall again. The AMS team presented for 3 days at CERN in April 2015, covering new data on 300 million proton events and helium flux. It revealed in December 2016 that it had discovered a few signals consistent with antihelium nuclei amidst several billion helium nuclei. The result remains to be verified, and the team is currently trying to rule out possible contamination. A study from 2019, using data from NASA's Fermi Gamma-ray Space Telescope discovered
13230-491: The reference point for surveying in Switzerland. The second main river of Geneva is the Arve , which flows into the Rhône just west of the city centre. Mont Blanc can be seen from Geneva and is an hour's drive from the city. The climate of Geneva is a temperate climate , more specifically an oceanic climate ( Köppen climate classification : Cfb ). Winters are cool, usually with light frosts at night and thawing conditions during
13356-431: The remaining Space Shuttle flights. After the 2003 Columbia disaster , NASA decided to reduce shuttle flights and retire the remaining shuttles by 2010. A number of flights were removed from the remaining manifest, including the flight for AMS-02. In 2006, NASA studied alternative ways of delivering AMS-02 to the space station, but they all proved to be too expensive. In May 2008, a bill was proposed to launch AMS-02 to
13482-444: The same, with a few gets reversed; the electron's antiparticle, positron, has an opposite charge. To differentiate between antiparticles and particles, a plus or negative sign is added in superscript . For example, the electron and the positron are denoted e and e . When a particle and an antiparticle interact with each other, they are annihilated and convert to other particles. Some particles, such as
13608-622: The scale of protons and neutrons , while the study of combination of protons and neutrons is called nuclear physics . The fundamental particles in the universe are classified in the Standard Model as fermions (matter particles) and bosons (force-carrying particles). There are three generations of fermions, although ordinary matter is made only from the first fermion generation. The first generation consists of up and down quarks which form protons and neutrons , and electrons and electron neutrinos . The three fundamental interactions known to be mediated by bosons are electromagnetism ,
13734-415: The schedule before the space shuttle program was discontinued. In January 2009, NASA restored AMS-02 to the shuttle manifest. On August 26, 2010, AMS-02 was delivered from CERN to the Kennedy Space Center by a Lockheed C-5 Galaxy jet. It was delivered to the International Space Station on May 19, 2011, as part of station assembly flight ULF6 on shuttle flight STS-134 , commanded by Mark Kelly . It
13860-422: The single family homes, 197 were built before 1919, while 20 were built between 1990 and 2000. The greatest number of single family homes (277) were built between 1919 and 1945. In 2000 , there were 101,794 apartments in the municipality. The most common apartment size was 3 rooms of which there were 27,084. There were 21,889 single room apartments and 11,166 apartments with five or more rooms. Of these apartments,
13986-470: The space-borne Alpha Magnetic Spectrometer confirm an unexplained excess of high-energy positrons in Earth-bound cosmic rays." These results are consistent with the positrons originating from the annihilation of dark matter particles in space, but not yet sufficiently conclusive to rule out other explanations. Ting said "Over the coming months, AMS will be able to tell us conclusively whether these positrons are
14112-445: The spacewalk was 6 hours and 16 minutes. About 1,000 cosmic rays are recorded by the instrument per second, generating about one GB/s of data. This data is filtered and compressed to about 300 kbit/s for download to the operation center POCC at CERN. A mockup of the machine is present inside the operations center at CERN. The detector module consists of a series of detectors that are used to determine various characteristics of
14238-413: The spacewalk was 6 hours and 33 minutes. The third spacewalk was conducted on December 2, 2019. The crew completed the primary task of installing the upgraded cooling system, called the upgraded tracker thermal pump system (UTTPS), completed the power and data cable connections for the system, and connected all eight cooling lines from the AMS to the new system. The intricate connection work required making
14364-402: The spacewalk was 6 hours and 39 minutes. The second spacewalk was conducted on November 22, 2019. Parmitano and Morgan cut a total of eight stainless steel tubes, including one that vented the remaining carbon dioxide from the old cooling pump. The crew members also prepared a power cable and installed a mechanical attachment device in advance of installing the new cooling system. The duration of
14490-416: The system and confirmed its reception of power and data. The duration of the spacewalk was 6 hours and 2 minutes. The fourth spacewalk was conducted on January 25, 2020. The astronauts conducted leak checks for the cooling system on the AMS and opened a valve to pressurize the system. Parmitano found a leak in one of the AMS's cooling lines. The leak was fixed during the spacewalk. Preliminary testing showed
14616-493: The total cost of the AMS program was estimated to be $ 33 million, with AMS-02 planned for flight to the ISS in 2003. After the Space Shuttle Columbia disaster in 2003, and after a number of technical difficulties with the construction of AMS-02, the cost of the program ballooned to an estimated $ 2 billion. For several years it was uncertain if AMS-02 would ever be launched because it was not manifested to fly on any of
14742-464: Was 0.25%. In June 2011, the average price of an apartment in and around Geneva was 13,681 CHF per square metre (11 sq ft). The average can be as high as 17,589 Swiss francs (CHF) per square metre (11 sq ft) for a luxury apartment and as low as 9,847 Swiss francs (CHF) for an older or basic apartment. For houses in and around Geneva, the average price was 11,595 Swiss francs (CHF) per square metre (11 sq ft) (June 2011), with
14868-801: Was 2003. The highest temperature recorded in Genève–Cointrin was 39.7 °C (103.5 °F) in July 2015, and the lowest temperature recorded was −20.0 °C (−4.0 °F) in February 1956. The city is divided into eight quartiers , or districts, sometimes composed of several neighbourhoods. On the left bank are: (1) Jonction, (2) Centre, Plainpalais , and Acacias; (3) Eaux-Vives; and (4) Champel . The right bank includes: (1) Saint-Jean and Charmilles; (2) Servette and Petit-Saconnex; (3) Grottes and Saint-Gervais; and (4) Paquis and Nations. The Administrative Council ( French : Conseil administratif ) constitutes
14994-506: Was admitted to the Swiss Confederation . In 1907, the separation of Church and State was adopted. Geneva flourished in the 19th and 20th centuries, becoming the seat of many international organizations. Geneva is located at 46°12' North, 6°09' East, at the south-western end of Lake Geneva , where the Rhône flows out. It is surrounded by three mountain chains, each belonging to the Jura :
15120-566: Was an increase of 135 and the non-Swiss population increased by 3181 people. This represents a population growth rate of 1.8%. As of 2000 , children and teenagers (0–19 years old) made up 18.2% of the population, while adults (20–64 years old) made up 65.8% and seniors (over 64 years old) make up 16%. As of 2000 , there were 78,666 people who were single and never married in the municipality. There were 74,205 married individuals, 10,006 widows or widowers and 15,087 individuals who are divorced. As of 2000 , there were 86,231 private households in
15246-678: Was composed of a single, unique type of particle. The word atom , after the Greek word atomos meaning "indivisible", has since then denoted the smallest particle of a chemical element , but physicists later discovered that atoms are not, in fact, the fundamental particles of nature, but are conglomerates of even smaller particles, such as the electron . The early 20th century explorations of nuclear physics and quantum physics led to proofs of nuclear fission in 1939 by Lise Meitner (based on experiments by Otto Hahn ), and nuclear fusion by Hans Bethe in that same year; both discoveries also led to
15372-475: Was known as the Protestant Rome due to it being the base of John Calvin , William Farel , Theodore Beza and other Protestant reformers . Over the past century, substantial immigration from France and other predominantly Catholic countries, as well as general secularization, has changed its religious landscape. As a result, three times as many Roman Catholics as Protestants lived in the city in 2000, while
15498-689: Was mentioned in Latin texts, by Caesar , with the spelling Genava , probably from the Celtic * genawa- from the stem * genu- ("mouth"), in the sense of an estuary , an etymology shared with the Italian port city of Genoa (in Italian Genova ). The medieval county of Geneva in Middle Latin was known as pagus major Genevensis or Comitatus Genevensis (also Gebennensis ). After 1400 it became
15624-601: Was proposed in 1995 by the Antimatter Study Group , led by MIT particle physicist Samuel Ting, not long after the cancellation of the Superconducting Super Collider . The original name for the instrument was Antimatter Spectrometer , with the stated objective to search for primordial antimatter, with a target resolution of antimatter/matter ≈10. The proposal was accepted and Ting became the principal investigator . An AMS prototype designated AMS-01 ,
15750-580: Was removed from the shuttle cargo bay using the shuttle's robotic arm and handed off to the station's robotic arm for installation. AMS-02 is mounted on top of the Integrated Truss Structure , on USS-02, the zenith side of the S3-element of the truss. By April 2017, only one of the 4 redundant coolant pumps for the silicon trackers was fully working, and repairs were being planned, despite AMS-02 not being designed to be serviced in space. By 2019,
15876-410: Was the second most common (7,853 or 4.4%), followed by Spanish (7,462 or 4.2%), Italian (7,320 or 4.1%), and German (7,050 or 4.0%); 113 spoke Romansh , an official language in Switzerland. In the city of Geneva, as of 2013 , 48% of the population are resident foreign nationals. For a list of the largest groups of foreign residents see the cantonal overview . Over the last 10 years (1999–2009),
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