Theta meson: Difference between revisions
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{{Short description|Hypothetical form of quarkonium}} |
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{{Hatnote|Not to be confused with the θ<sup>+</sup> of the [[τ–θ puzzle]], which is now identified as [[kaon]], or with the Θ<sup>+</sup> and {{Physics particle|Θ|TR=+|BR=c}}, formerly thought to be [[pentaquark]]s.}} |
{{Hatnote|Not to be confused with the θ<sup>+</sup> of the [[τ–θ puzzle]], which is now identified as [[kaon]], or with the Θ<sup>+</sup> and {{Physics particle|Θ|TR=+|BR=c}}, formerly thought to be [[pentaquark]]s.}} |
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{{Infobox |
{{Infobox particle |
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| name = Theta meson |
| name = Theta meson |
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| image = Quark structure toponium.svg |
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| caption = Quark structure of the theta meson |
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| num_types = |
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| composition = {{SubatomicParticle|Top quark}}{{SubatomicParticle|Top antiquark}} |
| composition = {{SubatomicParticle|Top quark}}{{SubatomicParticle|Top antiquark}} |
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| statistics = [[ |
| statistics = [[bosonic]] |
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| group = |
| group = |
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| interaction = [[Strong interaction| |
| interaction = [[Strong interaction|strong]], [[Weak interaction|weak]], [[Gravity|gravitational]], [[Electromagnetism|electromagnetic]] |
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| antiparticle = |
| antiparticle = self |
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| status = |
| status = hypothetical |
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| theorized = |
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| discovered = |
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| symbol = |
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| mass = |
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| mean_lifetime = |
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| decay_particle = |
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| electric_charge = 0 [[Elementary charge|''e'']] |
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| spin = |
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| strangeness = |
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| charm = |
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| bottomness = |
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| topness = |
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| isospin = 0 |
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| hypercharge = 0 |
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| parity = −1 |
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| c_parity = −1 |
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}} |
}} |
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The '''theta meson''' ({{Subatomic particle|Theta meson}})<ref>http://pdg.lbl.gov/2014/reviews/rpp2014-rev-naming-scheme-hadrons.pdf</ref> is a hypothetical form of [[quarkonium]] (i.e. a [[flavour (particle physics)|flavourless]] [[meson]]) formed by a [[top quark]] ({{SubatomicParticle|Top quark}}) and top antiquark ({{SubatomicParticle|Top antiquark}}). As a [[parity (physics)|P-odd]] and [[charge parity|C-odd]] {{SubatomicParticle|Top quark}}{{SubatomicParticle|Top antiquark}} state, it is analogous to the [[phi meson|{{SubatomicParticle|phi meson}}]] ({{SubatomicParticle|Strange quark}}{{SubatomicParticle|Strange antiquark}}), [[J/psi meson|{{SubatomicParticle|J/psi}}]] ({{SubatomicParticle|Charm quark}}{{SubatomicParticle|Charm antiquark}}) and [[upsilon meson|{{SubatomicParticle|Upsilon}}]] ({{SubatomicParticle|Bottom quark}}{{SubatomicParticle|Bottom antiquark}}) mesons. Due to the top quark's short lifetime, the theta meson is expected to not be observed in nature. |
The '''theta meson''' ({{Subatomic particle|Theta meson}})<ref>{{cite web |last1=Roos |first1=M. |last2=Wohl |first2=C.G. |title=Naming Scheme for Hadrons |url=http://pdg.lbl.gov/2014/reviews/rpp2014-rev-naming-scheme-hadrons.pdf |website=lbl.gov |access-date=23 March 2022}}</ref> is a hypothetical form of [[quarkonium]] (i.e. a [[flavour (particle physics)|flavourless]] [[meson]]) formed by a [[top quark]] ({{SubatomicParticle|Top quark}}) and top antiquark ({{SubatomicParticle|Top antiquark}}). As a [[parity (physics)|P-odd]] and [[charge parity|C-odd]] {{SubatomicParticle|Top quark}}{{SubatomicParticle|Top antiquark}} state, it is analogous to the [[phi meson|{{SubatomicParticle|phi meson}}]] ({{SubatomicParticle|Strange quark}}{{SubatomicParticle|Strange antiquark}}), [[J/psi meson|{{SubatomicParticle|J/psi}}]] ({{SubatomicParticle|Charm quark}}{{SubatomicParticle|Charm antiquark}}) and [[upsilon meson|{{SubatomicParticle|Upsilon}}]] ({{SubatomicParticle|Bottom quark}}{{SubatomicParticle|Bottom antiquark}}) mesons. Due to the top quark's short lifetime, the theta meson is expected to not be observed in nature.<ref>{{cite journal|doi=10.1007/s100520050144|arxiv=hep-ph/9704261|title=Top mesons|first=N.|last=Fabiano|journal=European Physical Journal C|volume=2|pages=345–350|year=1998|issue=2|bibcode=1998EPJC....2..345F |s2cid=17321939}}</ref> |
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==See also== |
==See also== |
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*[[List of mesons]] |
*[[List of mesons]] |
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==References== |
==References== |
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{{reflist}} |
{{reflist}} |
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[[Category:Mesons]] |
[[Category:Mesons]] |
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[[Category:Onia]] |
[[Category:Onia]] |
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[[Category:Hypothetical composite particles]] |
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[[Category:Subatomic particles with spin 1]] |
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{{particle-stub}} |
{{particle-stub}} |
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Latest revision as of 02:56, 4 June 2024
 Quark structure of the theta meson | |
| Composition | t t |
|---|---|
| Statistics | bosonic |
| Interactions | strong, weak, gravitational, electromagnetic |
| Status | hypothetical |
| Antiparticle | self |
| Electric charge | 0 e |
| Isospin | 0 |
| Hypercharge | 0 |
| Parity | −1 |
| C parity | −1 |
The theta meson (
θ
)[1] is a hypothetical form of quarkonium (i.e. a flavourless meson) formed by a top quark (
t
) and top antiquark (
t
). As a P-odd and C-odd
t
t
state, it is analogous to the
ϕ
(
s
s
),
J/ψ
(
c
c
) and
ϒ
(
b
b
) mesons. Due to the top quark's short lifetime, the theta meson is expected to not be observed in nature.[2]
See also
[edit]References
[edit]- ^ Roos, M.; Wohl, C.G. "Naming Scheme for Hadrons" (PDF). lbl.gov. Retrieved 23 March 2022.
- ^ Fabiano, N. (1998). "Top mesons". European Physical Journal C. 2 (2): 345–350. arXiv:hep-ph/9704261. Bibcode:1998EPJC....2..345F. doi:10.1007/s100520050144. S2CID 17321939.
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