Observation of excited Ω<i><sub>c</sub></i><SUP>0</SUP> baryons in Ω<i><sub>b</sub></i><SUP>-</SUP> → Ξ<i><sub>c</sub></i><SUP>+</SUP> <i>K</i><SUP>-</SUP><i>π</i><SUP>-</SUP> decays



Aaij, R, Beteta, C Abellan, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S
et al (show 960 more authors) (2021) Observation of excited Ω<i><sub>c</sub></i><SUP>0</SUP> baryons in Ω<i><sub>b</sub></i><SUP>-</SUP> → Ξ<i><sub>c</sub></i><SUP>+</SUP> <i>K</i><SUP>-</SUP><i>π</i><SUP>-</SUP> decays. PHYSICAL REVIEW D, 104 (9). 9-.

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Abstract

The first observation of the $\Omega_b^- \to \Xi_c^+ K^- \pi^-$ decay is reported using $pp$ collision data at centre-of-mass energies of 7, 8 and 13\,$\mathrm{TeV}$ collected by the LHCb experiment, corresponding to an integrated luminosity of 9\,$\mathrm{fb}^{-1}$. Four excited $\Omega_c^0$ baryons are observed in the $\Xi_c^+ K^-$ mass projection of the $\Omega_b^- \to \Xi_c^+ K^- \pi^-$ decays with the significance of each exceeding five standard deviations. They coincide with the states previously observed in prompt \proton\proton and $e^+e^-$ production. Relative production rates, masses and natural widths of the states are measured, and a test of spin hypotheses is performed. Moreover, the branching ratio of $\Omega_b^- \to \Xi_c^+ K^- \pi^-$ is measured relative to the $\Omega_b^- \to \Omega_c^0 \pi^-$ decay mode and a precise measurement of the $\Omega_b^-$ mass of \mbox{$6044.3 \pm 1.2 \pm 1.1^{\,+0.19}_{\,-0.22}\,\mathrm{MeV}$} is obtained.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-012.html (LHCb public pages)
Uncontrolled Keywords: hep-ex, hep-ex
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Sep 2021 09:24
Last Modified: 19 Oct 2023 09:21
DOI: 10.1103/PhysRevD.104.L091102
Open Access URL: https://journals.aps.org/prd/abstract/10.1103/Phys...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3134953