Study of b−b-hadron decays to Λc+h−h′−\Lambda_c^+h^-h^{\prime -} final states

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Publication date
22 May 2024
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Abstract

Decays of Ξb−\Xi_{b}^{-} and Ωb−\Omega_{b}^{-} baryons to Λc+h−h′−\Lambda_{c}^{+} h^- h^{\prime -} final states, with h−h′−h^- h^{\prime -} being π−π−\pi^{-}\pi^{-}, K−π−K^{-}\pi^{-} and K−K−K^{-}K^{-} meson pairs, are searched for using data collected with the LHCb detector. The data sample studied corresponds to an integrated luminosity of 8.7fb−18.7 \rm fb^{-1} of pppp collisions collected at centre-of-mass energies s=7\sqrt{s} = 7, 88 and 13TeV13 \rm TeV. The products of the relative branching fractions and fragmentation fractions for each signal mode, relative to the B−→Λc+pˉπ−B^{-} \rightarrow \Lambda_{c}^{+} \bar{p} \pi^{-} mode, are measured, with Ξb−→Λc+K−π−\Xi_{b}^{-} \rightarrow\Lambda_{c}^{+} K^{-} \pi^{-}, Ξb−→Λc+K−K−\Xi_{b}^{-} \rightarrow\Lambda_{c}^{+} K^{-} K^{-} and Ωb−→Λc+K−K−\Omega_{b}^{-} \rightarrow\Lambda_{c}^{+} K^{-} K^{-} decays being observed at over 5 σ5\,\sigma significance. The Ξb−→Λc+K−π−\Xi_{b}^{-} \rightarrow\Lambda_{c}^{+} K^{-} \pi^{-} mode is also used to measure the Ξb−\Xi_{b}^{-} production asymmetry, which is found to be consistent with zero. In addition, the B−→Λc+pˉK−B^{-} \rightarrow \Lambda_{c}^{+} \bar{p} K^{-} decay is observed for the first time, and its branching fraction is measured relative to that of the B−→Λc+pˉπ−B^{-} \rightarrow \Lambda_{c}^{+} \bar{p} \pi^{-} mode.Decays of Ξb−\Xi_b^- and Ωb−\Omega_b^- baryons to Λc+h−h′−\Lambda_c^+ h^- h^{\prime -} final states, with h−h′−h^- h^{\prime -} being π−π−\pi^-\pi^-, K−π−K^-\pi^- and K−K−K^-K^- meson pairs, are searched for using data collected with the LHCb detector. The data sample studied corresponds to an integrated luminosity of 8.7 fb−18.7\,\mathrm{fb}^{-1} of pppp collisions collected at centre-of-mass energies s=7\sqrt{s} = 7, 88 and 13 TeV13\,\mathrm{Te\kern -0.1em V}. The products of the relative branching fractions and fragmentation fractions for each signal mode, relative to the B−→Λc+p‾π−B^- \to \Lambda_c^+ \overline{p} \pi^- mode, are measured, with Ξb−→Λc+K−π−\Xi_{b}^- \to\Lambda_{c}^+ K^- \pi^-, Ξb−→Λc+K−K−\Xi_{b}^- \to\Lambda_{c}^+ K^- K^- and Ωb−→Λc+K−K−\Omega_{b}^- \to\Lambda_{c}^+ K^- K^- decays being observed at over 5 σ5\,\sigma significance. The Ξb−→Λc+K−π−\Xi_{b}^- \to\Lambda_{c}^+ K^- \pi^- mode is also used to measure the Ξb−\Xi_{b}^- production asymmetry, which is found to be consistent with zero. In addition, the B−→Λc+p‾K−B^- \to \Lambda_{c}^+ \overline{p} K^- decay is observed for the first time, and its branching fraction is measured relative to that of the B−→Λc+p‾π−B^- \to \Lambda_{c}^+ \overline{p} \pi^- mode

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