CMS results on beauty baryon spectroscopy
DOI:
https://doi.org/10.31349/SuplRevMexFis.3.0308023Keywords:
hadron spectroscopy, baryon spectroscopy, excited states, flavor physics, flavor spectroscopyAbstract
Recent beauty baryon physics results from the CMS collaboration, obtained using the proton-proton collision data collected at √ s = 13 TeV, are discussed. Observation of the Λ 0 b → J/ψΛφ decay and measurement of its branching fraction, relative to the Λ 0 b → ψ(2S)Λ decay, is reported. The excited baryon states Λb(5912)0 , Λb(5920)0 , Λb(6146)0 , and Λb(6152)0 are confirmed and their masses are measured. Observation of a new excited beauty strange baryon, labeled as Ξb(6100)∗−, is presented.
References
S. Chatrchyan et al. (CMS Collaboration), The CMS experiment at the CERN LHC, JINST 3 (2008) S08004, https://doi.org/10.1088/1748-0221/3/08/S08004.
R. Aaij et al. (LHCb Collaboration), Observation of J/ψp resonances consistent with pentaquark states in Λ 0 b → J/ψpK − decays, Phys. Rev. Lett. 115 (2015) 072001, https://dx. doi.org/10.1103/PhysRevLett.115.072001.
R. Aaij et al., Evidence of a J/ψΛ structure and observation of excited Ξ − states in the Ξ − b → J/ψpK − decay, Sci. Bull. 66 (2021) 1278-1287, https://dx.doi.org/10.1016/j. scib.2021.02.030doi:10.1016/j.scib.2021.02.030.
A.M. Sirunyan, et al. (CMS Collaboration), Observation of the Λ 0 b → J/ψΛφ decay in proton-proton collisions at √ s = 13 TeV, Phys. Lett. B 802 (2020) 135203, https://dx.doi. org/10.1016/j.physletb.2020.135203.
G. Punzi, Sensitivity of searches for new signals and its optimization, eConf C030908 (2003) MODT002, https://arxiv.org/abs/physics/0308063.
R. Aaij et al., Observation of excited Λ 0 b baryons, Phys.Rev.Lett. 109 (2012) 172003, https://dx.doi.org/10.1103/PhysRevLett.109.172003.
T. Aaltonen et al., (CDF Collaboration), Evidence for a bottom baryon resonance Λ 0∗ b in CDF data, Phys. Rev. D. 88 (2013) 071101, https://dx.doi.org/10.1103/PhysRevD. 88.071101.
A.M. Sirunyan, et al. (CMS Collaboration), Study of excited Λ 0 b states decaying to Λ 0 bπ +π − in proton-proton collisions at √ s = 13 TeV, Phys.Lett.B 803 (2020) 135345, https:// dx.doi.org/10.1016/j.physletb.2020.135345.
R. Aaij et al. (LHCb Collaboration), Observation of new resonances in Λ 0 bπ +π −system, Phys. Rev.Lett. 123 (2019) 152001, https://dx.doi.org/10.1103/PhysRevLett. 123.152001.
R. Aaij et al. (LHCb Collaboration), Observation of a new baryon state in the Λ 0 bπ +π −mass spectrum, JHEP 06 (2020) 136, https://doi.org/10.1007/JHEP06(2020) 136.
A.M. Sirunyan, et al. (CMS Collaboration), Observation of a new excited beauty strange baryon decaying to Ξ − b π +π −, Phys.Rev.Lett. 126 (2021) 252003, https://dx.doi. org/10.1103/PhysRevLett.126.252003.
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Copyright (c) 2022 Sergey Polikarpov (Author)
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