strange quark matter

Copyright © 2020 Elsevier B.V. or its licensors or contributors. However, new hadrons were discovered and the 'particle zoo' grew from a few particles in the early 1930s and 1940s to several dozens of them in the 1950s. The first evidence for the existence of quarks came in 1968, in deep inelastic scattering experiments at the Stanford Linear Accelerator Center. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. In 1961, Gell-Mann[7] and Yuval Ne'eman[8] independently proposed a hadron classification scheme called the Eightfold Way, also known as SU(3) flavor symmetry. The strange quark or s quark (from its symbol, s) is the third lightest of all quarks, a type of elementary particle. https://www.thefreedictionary.com/Strange+quark+matter, Quark matter that contains up, down, and strange quarks, as distinguished from nonstrange quark matter. Another remarkable implication of the hypothesis is the possible existence of a new class of white dwarfs. Examples of hadrons containing strange quarks include kaons ( K ), strange D mesons ( D s), Sigma baryons ( Σ ), and other strange particles. Several more or less exotic phases have been proposed to exist: pion condensation, kaon condensation, hyperon matter, and finally quark matter including strange quarks (see, e.g., [2, 3] for a discussion on the various phases). [1] Like all quarks, the strange quark is an elementary fermion with spin 1/2, and experiences all four fundamental interactions: gravitation, electromagnetism, weak interactions, and strong interactions. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. The strange quark or s quark (from its symbol, s) is the third lightest of all quarks, a type of elementary particle. The physical basis behind both isospin and strangeness was only explained in 1964, when Gell-Mann[9] and George Zweig[10][11] independently proposed the quark model, which at that time consisted only of the up, down, and strange quarks. The Gell-Mann–Nishijima formula is the result of these efforts to understand strange decays. While the quark model explained the Eightfold Way, no direct evidence of the existence of quarks was found until 1968 at the Stanford Linear Accelerator Center. Along with the charm quark, it is part of the second generation of matter. The antiparticle of the strange quark is the strange antiquark (sometimes called antistrange quark or simply antistrange), which differs from it only in that some of its properties have equal magnitude but opposite sign. Strange quark matter The rst speculation about the possible existence of collapsed nuclei was given by Bodmer [5]. Strange Quark Matter. If strange matter existed in space, if it were hurled at Earth, if it were stable at the pressures in space and on Earth, if it were more stable than our matter and if it were negatively charged -- it could turn you into a lump of unruly quarks. [12] Up and down quarks were the carriers of isospin, while the strange quark carried strangeness. Also called strange quark matter Viewed 91 times 2 $\begingroup$ I am watching a video on neutron stars. When they decayed through the weak interactions, they had lifetimes of around 10−10 seconds. [19], "Isotopic Spin and New Unstable Particles", "Charge Independence Theory of V Particles", "Observed Behavior of Highly Inelastic Electron–Proton Scattering", https://en.wikipedia.org/w/index.php?title=Strange_quark&oldid=985215044, Creative Commons Attribution-ShareAlike License, This page was last edited on 24 October 2020, at 17:13. The composition of the core of a neutron star is a matter of intense debate. Examples of hadrons containing strange quarks include kaons (K), strange D mesons (Ds), Sigma baryons (Σ), and other strange particles. Several experiments are using heavy ion collisions as a means of creating and studying strange quark matter in the laboratory. Some particles were much longer lived than others; most particles decayed through the strong interaction and had lifetimes of around 10−23 seconds. Strange quark matter synonyms, Strange quark matter pronunciation, Strange quark matter translation, English dictionary definition of Strange quark matter. We use cookies to help provide and enhance our service and tailor content and ads. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. The video is discussing the collision of 2 neutron (quark) stars and the ejection of strangelets. STRANGE QUARK MATTER IN COSMOLOGY AND ASTROPHYSICS 2.1 The big bang In addressing the problem of dark matter in our universe, it was speculated3 that some of the missing matter could possibly exist in the form of strange quark matter which was created when the universe underwent its quark to hadron tran- sition at a temperature of 200 MeV. This ordered hadrons into isospin multiplets. quark phase. In the beginnings of particle physics (first half of the 20th century), hadrons such as protons, neutrons and pions were thought to be elementary particles. He argued that another form of baryonic matter might be more stable than ordinary nuclei. The EoS of a strange star matter (strange matter EoS or MIT EoS) is then given by, P = 1 3 (e - 4B), where P is the pressure, e is the energy density and B is the bag constant, which is taken to be 1014gm/cm3. This EoS has sometimes These experiments confirmed the existence of up and down quarks, and by extension, strange quarks, as they were required to explain the Eightfold Way. The first strange particle (a particle containing a strange quark) was discovered in 1947 (kaons), but the existence of the strange quark itself (and that of the up and down quarks) was only postulated in 1964 by Murray Gell-Mann and George Zweig to explain the Eightfold Way classification scheme of hadrons. [13][14] Deep inelastic scattering experiments indicated that protons had substructure, and that protons made of three more-fundamental particles explained the data (thus confirming the quark model). I will describe why I think it is important and interesting to look for strange quark matter, and discuss the physics addressed by the experiments that have been designed to look for it in high energy heavy ion collisions. [2] The name sideways has also been used because the s quark has an I3 value of 0 while the u (“up”) and d (“down”) quarks have values of +1/2 and −1/2 respectively.[3]. [15], At first people were reluctant to identify the three-bodies as quarks, instead preferring Richard Feynman's parton description,[16][17][18] but over time the quark theory became accepted (see November Revolution). Also called, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content. Despite their work, the relationships between each particle and the physical basis behind the strangeness property remained unclear. Strange quarks are found in subatomic particles called hadrons. More than that, according to the strange matter hypothesis strange quark matter could be more stable than nuclear matter, in which case neutron stars should be largely composed of pure quark matter possibly enveloped in thin nuclear crusts. Ask Question Asked 1 year, 4 months ago. By continuing you agree to the use of cookies. It has an electric charge of −1/3 e and a bare mass of 95+9−3 MeV/c2. According to the IUPAP the symbol s is the official name, while "strange" is to be considered only as a mnemonic. While studying these decays, Murray Gell-Mann (in 1953)[4][5] and Kazuhiko Nishijima (in 1955)[6] developed the concept of strangeness (which Nishijima called eta-charge, after the eta meson (η)) to explain the 'strangeness' of the longer-lived particles. Strange quarks are found in subatomic particles called hadrons. Copyright © 1995 Published by Elsevier B.V. https://doi.org/10.1016/0375-9474(95)00223-N. n. Quark matter that contains up, down, and strange quarks, as distinguished from nonstrange quark matter. Active 1 year, 4 months ago.

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