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- 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 radius roughly one femtometre, 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 which compose the heavier mesons.Mesons are part of the hadron particle family, defined simply as particles composed of 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. There are at least five exotic meson resonances that have been experimentally confirmed to exist by two or more independent experiments. The most statistically significant of these is the Z(4430), discovered by Belle in 2007 and confirmed by LHCb in 2014. It is a candidate for being a tetraquark: a particle composed of two quarks and two antiquarks. Because quarks have a spin of 1⁄2, the difference in quark-number between mesons and baryons results in 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 0211411.
- Meson wikiPageExternalLink v=onepage&q=&f=false.
- Meson wikiPageExternalLink CM-P00073662.pdf.
- Meson wikiPageExternalLink c1.
- Meson wikiPageExternalLink cronin-lecture.pdf.
- Meson wikiPageExternalLink fitch-lecture.pdf.
- Meson wikiPageExternalLink pdg.lbl.gov.
- Meson wikiPageExternalLink namingrpp.pdf.
- Meson wikiPageExternalLink eng.pdf.
- Meson wikiPageExternalLink CDF_meson.html.
- Meson wikiPageExternalLink DZeroB_s.html.
- Meson wikiPageExternalLink mesons.php.
- Meson wikiPageID "19870".
- Meson wikiPageRevisionID "603765851".
- Meson caption "Mesons of spin 0 form a nonet".
- Meson composition "Composite—Quarks and antiquarks".
- Meson discovered "1947".
- Meson electricCharge "−1 e, 0 e, +1 e".
- Meson group "Hadrons".
- Meson hasPhotoCollection Meson.
- Meson interaction Strong_interaction.
- Meson mass "From 139 MeV/c2".
- Meson mass "to 9.460 GeV/c2".
- Meson name "Mesons".
- Meson numTypes "~140".
- Meson spin "1".
- Meson statistics Boson.
- Meson theorized Hideki_Yukawa.
- Meson subject Category:Mesons.
- Meson comment "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 radius roughly one femtometre, 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.".
- Meson label "Meson".
- Meson label "Meson".
- Meson label "Meson".
- Meson label "Mesone".
- Meson label "Mesón".
- Meson label "Mezony".
- Meson label "Méson".
- Meson label "Méson".
- Meson label "Мезон".
- Meson label "ميزون".
- Meson label "中間子".
- Meson label "介子".
- Meson sameAs Mezon.
- Meson sameAs Meson.
- Meson sameAs Μεσόνιο.
- Meson sameAs Mesón.
- Meson sameAs Méson.
- Meson sameAs Meson.
- Meson sameAs Mesone.
- Meson sameAs 中間子.
- Meson sameAs 중간자.
- Meson sameAs Meson.
- Meson sameAs Mezony.
- Meson sameAs Méson.
- Meson sameAs m.04_rh.
- Meson sameAs Q102742.
- Meson sameAs Q102742.
- Meson wasDerivedFrom Meson?oldid=603765851.
- Meson depiction Meson_nonet_-_spin_0.svg.
- Meson isPrimaryTopicOf Meson.
