Search for the doubly heavy ${\Xi }_{bc}^0$ baryon via decays to $D^{0}p{K}^{-}$

Abstract

A search for the doubly heavy ${\Xi }_{bc}^0$ baryon using its decay to the $D^{0}p{K}^{-}$ final state is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment between 2016 and 2018, corresponding to an integrated luminosity of 5.4 ${\mathrm{fb}}^{-1}$. No significant signal is found in the invariant mass range from 6.7 to 7.2 $\mathrm{GeV}/c^2$. Upper limits are set at $95\%$ credibility level on the ratio of the ${\Xi }_{bc}^0$ production cross-section times its branching fraction to $D^{0}p{K}^{-}$ relative to that of the ${\Lambda }_b^0\to D^{0}p{K}^{-}$ decay. The limits are set as a function of the ${\Xi }_{bc}^0$ mass and lifetime hypotheses, in the rapidity range from 2.0 to 4.5 and in the transverse momentum region from 5 to 25 $\mathrm{GeV}/c$. Upper limits range from $1.7\times 10^{-2}$ to $3.0\times 10^{-1}$ for the considered ${\Xi }_{bc}^0$ mass and lifetime hypotheses.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-014.html (LHCb public pages)