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Charmed baryons are a category of composite particles comprising all baryons made of at least one charm quark.[1] Since their first observation in the 1970s,[2] a large number of distinct charmed baryon states have been identified. Observed charmed baryons have masses ranging between 2300 and 2700 MeV/c2. In 2002, the SELEX collaboration, based at Fermilab published evidence of a doubly charmed baryon (
Ξ+
cc), containing two charm quarks, with a mass of ~3520 MeV/c2,[3] but has yet to be confirmed by other experiments.[4] However, the LHCb collaboration claims to have found evidence for the doubly charmed baryon (
Ξ++
cc) in 2017.[5] One triply charmed baryon (
Ω++
ccc) has been predicted[6] but not yet observed.
- ^ Cheng, Hai-Yang (2022-08-01). "Charmed baryon physics circa 2021". Chinese Journal of Physics. 78: 324–362. arXiv:2109.01216. doi:10.1016/j.cjph.2022.06.021. ISSN 0577-9073.
- ^ Cazzoli, E. G.; Cnops, A. M.; Connolly, P. L.; Louttit, R. I.; Murtagh, M. J.; Palmer, R. B.; Samios, N. P.; Tso, T. T.; Williams, H. H. (1975-04-28). "Evidence for ΔS=−ΔQ Currents or Charmed-Baryon Production by Neutrinos". Physical Review Letters. 34 (17): 1125–1128. doi:10.1103/physrevlett.34.1125. ISSN 0031-9007.
- ^ Mattson, M.; Alkhazov, G.; Atamantchouk, A. G.; Balatz, M. Y.; Bondar, N. F.; Cooper, P. S.; Dauwe, L. J.; Davidenko, G. V.; Dersch, U.; Dolgolenko, A. G.; Dzyubenko, G. B.; Edelstein, R.; Emediato, L.; Endler, A. M. F.; Engelfried, J. (2002-08-20). "First Observation of the Doubly Charmed Baryon Ξ c c +". Physical Review Letters. 89 (11). arXiv:hep-ex/0208014. doi:10.1103/PhysRevLett.89.112001. ISSN 0031-9007.
- ^ Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C. A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A. (2019-11-19). "Search for the doubly charmed baryon $$\Xi_{cc}^+$$". Science China Physics, Mechanics & Astronomy. 63 (2): 221062. arXiv:1909.12273. doi:10.1007/s11433-019-1471-8. ISSN 1869-1927.
- ^ Aaij, R.; Adeva, B.; Adinolfi, M.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.; Ali, S.; Alkhazov, G.; Alvarez Cartelle, P.; Alves, A. A.; Amato, S.; Amerio, S. (2017-09-11). "Observation of the Doubly Charmed Baryon Ξ c c + +". Physical Review Letters. 119 (11). arXiv:1707.01621. doi:10.1103/PhysRevLett.119.112001. ISSN 0031-9007.
- ^ Savage, Martin J.; Springer, Roxanne P. (1991-04-20). "Very charming baryons". International Journal of Modern Physics A. 06 (10): 1701–1712. doi:10.1142/S0217751X91000903. ISSN 0217-751X.