Search for the doubly heavy baryons ${\Omega }_{bc}^0$ and ${\Xi }_{bc}^0$ decaying to ${\Lambda }_c^{+}{\pi }^{-}$ and ${\Xi }_c^{+}{\pi }^{-}$

Abstract

The first search for the doubly heavy ${\Omega }_{bc}^0$ baryon and a search for ${\Xi }_{bc}^0$ baryon are performed using $pp$ collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of $13TeV$, corresponding to an integrated luminosity of 5.2$f{b}^{-1}$. The baryons are reconstructed via their decays to ${\Lambda }_c^{+}{\pi }^{-}$ and ${\Xi }_c^{+}{\pi }^{-}$. No significant excess is found for invariant masses between 6700 and 7300$MeV/c^2$, in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20$GeV/c$. Upper limits are set on the ratio of the ${\Omega }_{bc}^0$ and ${\Xi }_{bc}^0$ production cross-section times the branching fraction to ${\Lambda }_c^{+}{\pi }^{-}$ (${\Xi }_c^{+}{\pi }^{-}$) relative to that of the ${\Lambda }_b^0$ (${\Xi }_b^0$) baryon, for different lifetime hypotheses, at $95\%$ confidence level. The upper limits range from $0.5\times 10^{-4}$ to $2.5\times 10^{-4}$ for the ${\Omega }_{bc}^0\to {\Lambda }_c^{+}{\pi }^{-}$ (${\Xi }_{bc}^0\to {\Lambda }_c^{+}{\pi }^{-}$) decay, and from $1.4\times 10^{-3}$ to $6.9\times 10^{-3}$ for the ${\Omega }_{bc}^0\to {\Xi }_c^{+}{\pi }^{-}$ (${\Xi }_{bc}^0\to {\Xi }_c^{+}{\pi }^{-}$) decay, depending on the considered mass and lifetime of the ${\Omega }_{bc}^0$ (${\Xi }_{bc}^0$) baryon.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-002.html (LHCb public pages)

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• Doubly charmed pentaquark states in QCD sum rules
• Screening of quark charge and mixing effects on transition moments and M1 decay widths of baryons
• Mass spectra of bottom-charm baryons
• Light quark decays of doubly heavy baryons in light front approach
• Mass spectra of double-bottom baryons
• Search for the doubly heavy baryon ${\Xi }_{bc}^{+}$ decaying to $J/\psi {\Xi }_c^{+}$
• Strong decays of the low-lying doubly bottom baryons
• Static properties and Semileptonic transitions of lowest-lying double heavy baryons
• Inclusive weak-annihilation decays and lifetimes of beauty-charmed baryons
• Hadronic production of ${\Xi }_{bc}$ with the intrinsic heavy-quark content at a fixed-target experiment at the LHC
• Analysis of the bottom-charm baryon states with QCD sum rules
• Further study on the production of P-wave doubly heavy baryons from Z-boson decays
• Study of the mass spectra of doubly heavy ${\Xi }_{Q{Q}^{\prime }}$ and ${\Omega }_{Q{Q}^{\prime }}$ baryons
• The effects of polarization on the observables in the decay ${\Xi }_{cc}^{++}\to {\Xi }_c^{+}\bar{\ell }{\nu }_{\ell }$