Search for the doubly heavy baryons \itΩ_bc^\rm0 and \itΞ_bc^\rm0 decaying to \itΛ_c⁺π^- and \itΞ_c⁺π^-

2021/04/30 by LHCb collaboration, R. Aaij, C. Abellán Beteta +900 · 1 citation
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1088/1674-1137/ac0c70

published as Chin. Phys. C 45 (2021) 093002 · All 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)

arxiv created 2021/09/13 · arxiv updated 2021/09/14

Abstract

The first search for the doubly heavy \itΩ_bc^\rm0 baryon and a search for \itΞ_bc^\rm0 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 5.2fb^-1. The baryons are reconstructed via their decays to \itΛ_c⁺π^- and \itΞ_c⁺π^-. No significant excess is found for invariant masses between 6700 and 7300MeV/c², in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20GeV/c. Upper limits are set on the ratio of the \itΩ_bc^\rm0 and \itΞ_bc^\rm0 production cross-section times the branching fraction to \itΛ_c⁺π^- (\itΞ_c⁺π^-) relative to that of the \itΛ_b^\rm0 (\itΞ_b^\rm0) baryon, for different lifetime hypotheses, at 95% confidence level. The upper limits range from 0.5×10^-4 to 2.5×10^-4 for the \itΩ_bc^\rm0→\itΛ_c⁺π^- (\itΞ_bc^\rm0→\itΛ_c⁺π^-) decay, and from 1.4×10^-3 to 6.9×10^-3 for the \itΩ_bc^\rm0→\itΞ_c⁺π^- (\itΞ_bc^\rm0→\itΞ_c⁺π^-) decay, depending on the considered mass and lifetime of the \itΩ_bc^\rm0 (\itΞ_bc^\rm0) baryon.

Cited by

• Semileptonic decays of doubly charmed or bottom baryons to single heavy baryons