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Penguin Diagram
In quantum field theory, penguin diagrams are a class of Feynman diagrams which are important for understanding CP violating processes in the standard model. They refer to one-loop processes in which a quark temporarily changes flavor (via a W or Z loop), and the flavor-changed quark engages in some tree interaction, typically a strong one. For the interactions where some quark flavors (e.g., very heavy ones) have much higher interaction amplitudes than others, such as CP-violating or Higgs interactions, these penguin processes may have amplitudes comparable to or even greater than those of the direct tree processes. A similar diagram can be drawn for leptonic decays. They were first isolated and studied by Mikhail Shifman, Arkady Vainshtein, and Valentin Zakharov. The processes which they describe were first directly observed in 1991 and 1994 by the CLEO collaboration. Origin of the name John Ellis was the first to refer to a certain class of Feynman diagrams as "pengui ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Penguin Diagram
In quantum field theory, penguin diagrams are a class of Feynman diagrams which are important for understanding CP violating processes in the standard model. They refer to one-loop processes in which a quark temporarily changes flavor (via a W or Z loop), and the flavor-changed quark engages in some tree interaction, typically a strong one. For the interactions where some quark flavors (e.g., very heavy ones) have much higher interaction amplitudes than others, such as CP-violating or Higgs interactions, these penguin processes may have amplitudes comparable to or even greater than those of the direct tree processes. A similar diagram can be drawn for leptonic decays. They were first isolated and studied by Mikhail Shifman, Arkady Vainshtein, and Valentin Zakharov. The processes which they describe were first directly observed in 1991 and 1994 by the CLEO collaboration. Origin of the name John Ellis was the first to refer to a certain class of Feynman diagrams as "pengui ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuclear Physics B
Nuclear may refer to: Physics Relating to the nucleus of the atom: *Nuclear engineering *Nuclear physics *Nuclear power Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions. Presently, the vast majority of electricity from nuclear power is produced b ... *Nuclear reactor *Nuclear weapon *Nuclear medicine *Radiation therapy *Nuclear warfare Mathematics *Nuclear space *Nuclear operator *Nuclear congruence *Nuclear C*-algebra Biology Relating to the Cell nucleus, nucleus of the cell: * Nuclear DNA Society *Nuclear family, a family consisting of a pair of adults and their children Music *Nuclear (band), "Nuclear" (band), group music. *Nuclear (Ryan Adams song), "Nuclear" (Ryan Adams song), 2002 *"Nuclear", a song by Mike Oldfield from his ''Man on the Rocks'' album *Nu.Clear (EP), ''Nu.Clear'' (EP) by South Korean girl group CLC See also *Nucleus (disambigu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meyrin
Meyrin () is a municipality of the Canton of Geneva, Switzerland. The main site of CERN, the European particle physics research organisation, is in Meyrin. Meyrin was originally a small agricultural village until the 1950s, when construction of CERN began just to the north. It is now a commuter town dominated with apartment high-rises, and many of its residents work at CERN or in central Geneva. Geneva International Airport is partially located within Meyrin.Plan de commune ." Meyrin. Retrieved on 29 September 2009. History Meyrin is first mentioned in 1153 as ''Mairin''.Geography Meyrin has an area, , of . Of this area, or 35.6% is used for agricultural purposes, while or 4.3% is forested. Of the re ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Penguin
Penguins (order (biology), order List of Sphenisciformes by population, Sphenisciformes , family (biology), family Spheniscidae ) are a group of Water bird, aquatic flightless birds. They live almost exclusively in the Southern Hemisphere: only one species, the Galápagos penguin, is found north of the Equator. Highly adapted for life in the water, penguins have Countershading, countershaded dark and white plumage and flippers for swimming. Most penguins feed on krill, fish, squid and other forms of sea life which they catch with their bills and swallow it whole while swimming. A penguin has a spiny tongue and powerful jaws to grip slippery prey. They spend roughly half of their lives on land and the other half in the sea. The largest living species is the emperor penguin (''Aptenodytes forsteri''): on average, adults are about tall and weigh . The smallest penguin species is the Little penguin, little blue penguin (''Eudyptula minor''), also known as the fairy penguin, whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CERN
The European Organization for Nuclear Research, known as CERN (; ; ), is an intergovernmental organization that operates the largest particle physics laboratory in the world. Established in 1954, it is based in a northwestern suburb of Geneva, on the France–Switzerland border. It comprises 23 member states, and Israel (admitted in 2013) is currently the only non-European country holding full membership. CERN is an official United Nations General Assembly observer. The acronym CERN is also used to refer to the laboratory; in 2019, it had 2,660 scientific, technical, and administrative staff members, and hosted about 12,400 users from institutions in more than 70 countries. In 2016, CERN generated 49 petabytes of data. CERN's main function is to provide the particle accelerators and other infrastructure needed for high-energy physics research — consequently, numerous experiments have been constructed at CERN through international collaborations. CERN is the site of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serge Rudaz
Serge Rudaz (born August 19, 1954, pronounced "Rü-DAH") is a Canadians, Canadian theoretical physicist and Professor of Physics at the University of Minnesota. He previously served as the Director of Undergraduate Studies of the University of Minnesota's Physics Department, and is now the Director of Undergraduate Honors at the University of Minnesota. Rudaz received his Ph.D. in 1979 from Cornell University and his undergraduate degree from McGill University. Teaching In the spring of 2007, Rudaz was named as the director of the University of Minnesota's new campus-wide Honors program, which began operation during the fall of 2008. Research In 1995, he was elected Fellow of the American Physical Society "for original and influential contributions to the phenomenology of heavy quarks, supersymmetry and grand unification, and particle astrophysics." In 1985, Rudaz was the recipient of the Canadian Association of Physicists Herzberg Medal. He is the only physicist in the Herzber ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bottom Quark
The bottom quark or b quark, also known as the beauty quark, is a third-generation heavy quark with a charge of − ''e''. All quarks are described in a similar way by electroweak and quantum chromodynamics, but the bottom quark has exceptionally low rates of transition to lower-mass quarks. The bottom quark is also notable because it is a product in almost all top quark decays, and is a frequent decay product of the Higgs boson. Name and history The bottom quark was first described theoretically in 1973 by physicists Makoto Kobayashi and Toshihide Maskawa to explain CP violation. The name "bottom" was introduced in 1975 by Haim Harari. The bottom quark was discovered in 1977 by the Fermilab E288 experiment team led by Leon M. Lederman, when collisions produced bottomonium. Kobayashi and Maskawa won the 2008 Nobel Prize in Physics for their explanation of CP-violation. While the name "beauty" is sometimes used, "bottom" became the predominant usage by analogy of "to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grand Unification Theory
A Grand Unified Theory (GUT) is a model in particle physics in which, at high energies, the three gauge interactions of the Standard Model comprising the electromagnetic, weak, and strong forces are merged into a single force. Although this unified force has not been directly observed, many GUT models theorize its existence. If unification of these three interactions is possible, it raises the possibility that there was a grand unification epoch in the very early universe in which these three fundamental interactions were not yet distinct. Experiments have confirmed that at high energy the electromagnetic interaction and weak interaction unify into a single electroweak interaction. GUT models predict that at even higher energy, the strong interaction and the electroweak interaction will unify into a single electronuclear interaction. This interaction is characterized by one larger gauge symmetry and thus several force carriers, but one unified coupling constant. Unifying ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mike Chanowitz
Mike may refer to: Animals * Mike (cat), cat and guardian of the British Museum * Mike the Headless Chicken, chicken that lived for 18 months after his head had been cut off * Mike (chimpanzee), a chimpanzee featured in several books and documentaries Arts * Mike (miniseries), a 2022 Hulu limited series based on the life of American boxer Mike Tyson * Mike (2022 film), a Malayalam film produced by John Abraham * ''Mike'' (album), an album by Mike Mohede * ''Mike'' (1926 film), an American film * MIKE (musician), American rapper, songwriter and record * ''Mike'' (novel), a 1909 novel by P. G. Wodehouse * "Mike" (song), by Elvana Gjata and Ledri Vula featuring John Shahu * Mike (''Twin Peaks''), a character from ''Twin Peaks'' * "Mike", a song by Xiu Xiu from their 2004 album ''Fabulous Muscles'' Businesses * Mike (cellular network), a defunct Canadian cellular network * Mike and Ike, a candies brand Military * MIKE Force, a unit in the Vietnam War * Ivy Mike, the first te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Standard Model
The Standard Model of particle physics is the theory describing three of the four known fundamental forces (electromagnetism, electromagnetic, weak interaction, weak and strong interactions - excluding gravity) in the universe and classifying all known elementary particles. It was developed in stages throughout the latter half of the 20th century, through the work of many scientists worldwide, with the current formulation being finalized in the mid-1970s upon experimental confirmation of the existence of quarks. Since then, proof of the top quark (1995), the tau neutrino (2000), and the Higgs boson (2012) have added further credence to the Standard Model. In addition, the Standard Model has predicted various properties of weak neutral currents and the W and Z bosons with great accuracy. Although the Standard Model is believed to be theoretically self-consistent and has demonstrated huge successes in providing experimental predictions, it leaves some physics beyond the standard m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dimitri Nanopoulos
Dimitri V. Nanopoulos (; el, Δημήτρης Νανόπουλος; born 13 September 1948) is a Greek physicist. He is one of the most regularly cited researchers in the world, cited more than 48,500 times across a number of separate branches of science. Biography Dimitri Nanopoulos was born and raised in Athens. His grandfather, Dimitris Nakas, was an Aromanian and an ardent Greek nationalist who had migrated at the beginning of the 20th century to New York, but in March 1914 traveled back to his native land in order to participate in the Greek struggle for northern Epirus, and died in 1916; Nanopoulos' father was born nine months prior. His father's name was Vaios. His mother, Vasiliki Korasidi, was born in Kifissia but descended from the Greek island of Kea. Nanopoulos studied Physics at the University of Athens and he graduated in 1971, continuing his studies at the University of Sussex in England, where he obtained his Ph.D. in 1973 in High Energy Physics. He has been a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mary K
''Empire Beatrice'' was a cargo ship which was built by Lithgows Ltd, Port Glasgow in 1942. She was owned by the Ministry of War Transport (MoWT) and managed by David Alexander & Sons. Although badly damaged during the war, she was repaired and sold into merchant service after the war ended. She served with various shipping companies as ''Beatrice N'', ''Mary K'', ''Winchester Prowess'' and ''Grazia Bottigliere'', eventually being scrapped in 1966. Description ''Empire Beatrice'' was built for the MoWT by Lithgows Ltd, Port Glasgow. She was yard number 978. The ship was launched on 23 February 1942 and completed in April that year. She had a GRT of 7,046, NRT of 4,286 and a DWT of 10,750. ''Empire Beatrice'' was propelled by a triple expansion steam engine which had cylinders of 24½ inches (62 cm), and diameter and stroke. It was built by J G Kincaird Ltd, Greenock and developed . The ship was capable of . Wartime career After completion, ''Empire Beatrice'' was p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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