fields and particles in particle physics
and in the standard model of particle physics:
matter field fermions (spinors, Dirac fields)
flavors of fundamental fermions in the standard model of particle physics: | |||
---|---|---|---|
generation of fermions | 1st generation | 2nd generation | 3d generation |
quarks () | |||
up-type | up quark () | charm quark () | top quark () |
down-type | down quark () | strange quark () | bottom quark () |
leptons | |||
charged | electron | muon | tauon |
neutral | electron neutrino | muon neutrino | tau neutrino |
bound states: | |||
mesons | light mesons: pion () ρ-meson () ω-meson () f1-meson a1-meson | strange-mesons: ϕ-meson (), kaon, K*-meson (, ) eta-meson () charmed heavy mesons: D-meson (, , ) J/ψ-meson () | bottom heavy mesons: B-meson () ϒ-meson () |
baryons | nucleons: proton neutron |
(also: antiparticles)
hadrons (bound states of the above quarks)
minimally extended supersymmetric standard model
bosinos:
dark matter candidates
Exotica
A tetraquark is an exotic meson which is a bound state of four quarks, or rather: of a diquark and an anti-diquark.
The idea of tetraquarks is mentioned already in the original articles on quarks.
The original proposal for tetraquarks with two heavy quark constitutents?:
and fully heavy tetraquarks:
See also:
Discussion in view of hadron supersymmetry and diquark-models:
in holographic light front QCD:
in regards to experimental results:
Experimental detection of a tetraquark resonance made entirely of four charm quarks and argued to be the first observed “true” tetraquark state (instead of just a “diquark molecule”):
Popular exposition:
Theoretical explanation:
Ming-Sheng liu, Feng-Xiao Liu, Xian-Hui Zhong, Qiang Zhao, Full-heavy tetraquark states and their evidences in the LHCb di-J/ψ spectrum (arXiv:2006.11952)
Qi-Fang Lü, Dian-Yong Chen, Yu-Bing Dong, Masses of fully heavy tetraquarks in an extended relativized quark model, Eur. Phys. J. C 80, 871 (2020) (arXiv:2006.14445, doi:10.1140/epjc/s10052-020-08454-1)
reviewed in:
Jean-Marc Richard, About the peak of LHCb: fully-charmed tetraquark?, Science Bulletin Volume 65, Issue 23, 15 December 2020, Pages 1954-1955 (arXiv:2008.01962, doi:10.1016/j.scib.2020.08.020)
Jean-Marc Richard, Fully-heavy tetraquarks and other heavy multiquarks, Nuclear and Particle Physics Proceedings 00 (2021) 1–5 (arXiv:2105.02503)
Indication of a tetraquark with two charm quarks, and anti-up quark and an anti-down quark:
LHCb collaboration, Observation of an exotic narrow doubly charmed tetraquark (arXiv:2109.01038)
LHCb collaboration, Study of the doubly charmed tetraquark (arXiv:2109.01056)
Further discussion:
Sean Fleming, Reed Hodges, Thomas Mehen, Decays: Differential Spectra and Two-Body Final States (arXiv:2109.02188)
Huimin Ren, Fan Wu, Ruilin Zhu, Hadronic molecule interpretation of and its beauty-partners (arXiv:2109.02531)
Last revised on September 7, 2021 at 07:07:19. See the history of this page for a list of all contributions to it.