Decays of the Îb- and Ωb- baryons to the charmless final states ph-hâ²-, where h(â²) denotes a kaon or pion, are searched for with the LHCb detector. The analysis is based on a sample of proton-proton collision data collected at center-of-mass energies s=7 and 8 TeV, corresponding to an integrated luminosity of 3 fb-1. The decay Îb-âpK-K- is observed with a significance of 8.7 standard deviations, and evidence at the level of 3.4 standard deviations is found for the Îb-âpK-Ï- decay. Results are reported, relative to the B-âK+K-K- normalization channel, for the products of branching fractions and b-hadron production fractions. The branching fractions of Îb-âpK-Ï- and Îb-âpÏ-Ï- relative to Îb-âpK-K- decays are also measured.
Observation of the Decay Ξb- →pK-K-
De Serio, M.;Pappagallo, M.;
2017-01-01
Abstract
Decays of the Îb- and Ωb- baryons to the charmless final states ph-hâ²-, where h(â²) denotes a kaon or pion, are searched for with the LHCb detector. The analysis is based on a sample of proton-proton collision data collected at center-of-mass energies s=7 and 8 TeV, corresponding to an integrated luminosity of 3 fb-1. The decay Îb-âpK-K- is observed with a significance of 8.7 standard deviations, and evidence at the level of 3.4 standard deviations is found for the Îb-âpK-Ï- decay. Results are reported, relative to the B-âK+K-K- normalization channel, for the products of branching fractions and b-hadron production fractions. The branching fractions of Îb-âpK-Ï- and Îb-âpÏ-Ï- relative to Îb-âpK-K- decays are also measured.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.