Search for the doubly heavy baryon ${\Xi }_{bc}^{+}$ decaying to $J/\psi {\Xi }_c^{+}$

Abstract

A first search for the ${\Xi }_{bc}^{+}\to J/\psi {\Xi }_c^{+}$ decay is performed by the LHCb experiment with a data sample of proton-proton collisions, corresponding to an integrated luminosity of $9{\mathrm{fb}}^{-1}$ recorded at centre-of-mass energies of 7, 8, and $13\mathrm{Te}\mathrm{V}$. Two peaking structures are seen with a local (global) significance of $4.3(2.8)$ and $4.1(2.4)$ standard deviations at masses of $6571\mathrm{Me}\mathrm{V}/c^2$ and $6694\mathrm{Me}\mathrm{V}/c^2$, respectively. Upper limits are set on the ${\Xi }_{bc}^{+}$ baryon production cross-section times the branching fraction relative to that of the $B_c^{+}\to J/\psi D_s^{+}$ decay at centre-of-mass energies of 8 and $13\mathrm{Te}\mathrm{V}$, in the ${\Xi }_{bc}^{+}$ and in the $B_c^{+}$ rapidity and transverse-momentum ranges from 2.0 to 4.5 and 0 to $20\mathrm{Ge}\mathrm{V}/c$, respectively. Upper limits are presented as a function of the ${\Xi }_{bc}^{+}$ mass and lifetime.

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-2022-005.html (LHCb public pages)

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