We report the first observation of a baryonic B_s^0 decay, B_s^0→pΛ[over ¯]K^-, using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb^-1. The branching fraction is measured to be B(B_s^0→pΛ[over ¯]K^-)+B(B_s^0→p[over ¯]ΛK^+)=[5.46±0.61±0.57±0.50(B)±0.32(f_s/f_d)]×10^-6, where the first uncertainty is statistical and the second systematic, the third uncertainty accounts for the experimental uncertainty on the branching fraction of the B^0→pΛ[over ¯]π^- decay used for normalization, and the fourth uncertainty relates to the knowledge of the ratio of b-quark hadronization probabilities f_s/f_d.
First Observation of a Baryonic B_s^0 Decay
Veltri, M;
2017
Abstract
We report the first observation of a baryonic B_s^0 decay, B_s^0→pΛ[over ¯]K^-, using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb^-1. The branching fraction is measured to be B(B_s^0→pΛ[over ¯]K^-)+B(B_s^0→p[over ¯]ΛK^+)=[5.46±0.61±0.57±0.50(B)±0.32(f_s/f_d)]×10^-6, where the first uncertainty is statistical and the second systematic, the third uncertainty accounts for the experimental uncertainty on the branching fraction of the B^0→pΛ[over ¯]π^- decay used for normalization, and the fourth uncertainty relates to the knowledge of the ratio of b-quark hadronization probabilities f_s/f_d.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
