Search for the doubly heavy Ξ bc 0 $$ {\Xi}_{bc}^0 $$ baryon via decays to D 0 pK −

Abstract

Abstract A search for the doubly heavy Ξ bc 0 $$ {\Xi}_{bc}^0 $$ baryon using its decay to the D 0 pK – 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 fb −1. No significant signal is found in the invariant mass range from 6.7 to 7.2 GeV/c 2. Upper limits are set at 95% credibility level on the ratio of the Ξ bc 0 $$ {\Xi}_{bc}^0 $$ production cross-section times its branching fraction to D 0 pK − relative to that of the Λ b 0 → D 0 pK − $$ {\Lambda}_b^0\to {D}^0{pK}^{-} $$ decay. The limits are set as a function of the Ξ bc 0 $$ {\Xi}_{bc}^0 $$ mass and lifetime hypotheses, in the rapidity range from 2.0 to 4.5 and in the transverse momentum region from 5 to 25 GeV/c. Upper limits range from 1.7 × 10 −2 to 3.0 × 10 −1 for the considered Ξ bc 0 $$ {\Xi}_{bc}^0 $$ mass and lifetime hypotheses.

Keywords

• B physics
• Hadron-Hadron scattering (experiments)
• Heavy quark production
• QCD
• Spectroscopy