Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Meson> ?p ?o }
- Meson abstract "In particle physics, mesons (/ˈmiːzɒnz/ or /ˈmɛzɒnz/) are hadronic subatomic particles composed of one quark and one antiquark, bound together by the strong interaction. Because mesons are composed of sub-particles, they have a physical size, with a diameter of roughly one fermi, which is about 2⁄3 the size of a proton or neutron. All mesons are unstable, with the longest-lived lasting for only a few hundredths of a microsecond. Charged mesons decay (sometimes through intermediate particles) to form electrons and neutrinos. Uncharged mesons may decay to photons.Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, such particles are ordinary protons and neutrons. Mesons are also frequently produced artificially in high-energy particle accelerators that collide protons, anti-protons, or other particles.In nature, the importance of lighter mesons is that they are the associated quantum-field particles that transmit the nuclear force, in the same way that photons are the particles that transmit the electromagnetic force. The higher energy (more massive) mesons were created momentarily in the Big Bang, but are not thought to play a role in nature today. However, such particles are regularly created in experiments, in order to understand the nature of the heavier types of quark that compose the heavier mesons.Mesons are part of the hadron particle family, defined simply as particles composed of two quarks. The other members of the hadron family are the baryons: subatomic particles composed of three quarks rather than two. Some experiments show evidence of exotic mesons, which don't have the conventional valence quark content of one quark and one antiquark.Because quarks have a spin of 1⁄2, the difference in quark-number between mesons and baryons results in conventional two-quark mesons being bosons, whereas baryons are fermions.Each type of meson has a corresponding antiparticle (antimeson) in which quarks are replaced by their corresponding antiquarks and vice versa. For example, a positive pion (π+) is made of one up quark and one down antiquark; and its corresponding antiparticle, the negative pion (π−), is made of one up antiquark and one down quark.Because mesons are composed of quarks, they participate in both the weak and strong interactions. Mesons with net electric charge also participate in the electromagnetic interaction. They are classified according to their quark content, total angular momentum, parity and various other properties, such as C-parity and G-parity. Although no meson is stable, those of lower mass are nonetheless more stable than the most massive mesons, and are easier to observe and study in particle accelerators or in cosmic ray experiments. They are also typically less massive than baryons, meaning that they are more easily produced in experiments, and thus exhibit certain higher energy phenomena more readily than baryons composed of the same quarks would. For example, the charm quark was first seen in the J/Psi meson (J/ψ) in 1974, and the bottom quark in the upsilon meson (ϒ) in 1977.".
- Meson thumbnail Meson_nonet_-_spin_0.svg?width=300.
- Meson wikiPageExternalLink v=onepage&q=&f=false.
- Meson wikiPageExternalLink CM-P00073662.pdf.
- Meson wikiPageExternalLink cronin-lecture.pdf.
- Meson wikiPageExternalLink fitch-lecture.pdf.
- Meson wikiPageExternalLink eng.pdf.
- Meson wikiPageExternalLink 0211411.
- Meson wikiPageExternalLink c1.
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- Meson wikiPageWikiLink Ancient_Greek.
- Meson wikiPageWikiLink Angular_momentum.
- Meson wikiPageWikiLink Angular_momentum_operator.
- Meson wikiPageWikiLink Antiparticle.
- Meson wikiPageWikiLink Antiquark.
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- Meson wikiPageWikiLink Baryon.
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- Meson wikiPageWikiLink C-parity.
- Meson wikiPageWikiLink C._F._Powell.
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- Meson wikiPageWikiLink CP_violation.
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- Meson wikiPageWikiLink Carl_David_Anderson.
- Meson wikiPageWikiLink Category:Mesons.
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- Meson wikiPageWikiLink Charm_(quantum_number).
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- Meson wikiPageWikiLink Flavour_(particle_physics).
- Meson wikiPageWikiLink Flavour_quantum_number.
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- Meson wikiPageWikiLink G-parity.
- Meson wikiPageWikiLink Gell-Mann–Nishijima_formula.
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- Meson wikiPageWikiLink LHCb.
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- Meson wikiPageWikiLink List_of_mesons.
- Meson wikiPageWikiLink List_of_particles.
- Meson wikiPageWikiLink Longman_Publishing.
- Meson wikiPageWikiLink Ludwig_Maximilian_University_of_Munich.
- Meson wikiPageWikiLink Mass.
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- Meson wikiPageWikiLink Muon.
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- Meson wikiPageWikiLink Natural_units.
- Meson wikiPageWikiLink Neutrino.
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- Meson wikiPageWikiLink Nobel_Prize_in_Physics.
- Meson wikiPageWikiLink Nonet.
- Meson wikiPageWikiLink Nuclear_force.
- Meson wikiPageWikiLink Oxford_University_Press.
- Meson wikiPageWikiLink P-symmetry.
- Meson wikiPageWikiLink Parity_(physics).
- Meson wikiPageWikiLink Parity_violation.
- Meson wikiPageWikiLink Particle_Data_Group.