Observation of Bs0→χϕ decay and study of B0→χK*0 decays

Abstract

The first observation of the decay B0 s → χc1φ and a study of B0 → χc1,2K∗0 decays are presented. The analysis is performed using a dataset, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb experiment in pp collisions at a centre-of-mass energy of 7 TeV. The following ratios of branching fractions are measured: B(B0 s → χc1φ) B(B0 s → J/ψφ) = 18.9 ± 1.8 (stat) ± 1.3 (syst) ± 0.8(B) × 10−2, B(B0 → χc1K∗0) B(B0 → J/ψK∗0) = 19.8 ± 1.1 (stat) ± 1.2 (syst) ± 0.9(B) × 10−2, B(B0 → χc2K∗0) B(B0 → χc1K∗0) = 17.1 ± 5.0 (stat) ± 1.7 (syst) ± 1.1(B) × 10−2, where the third uncertainty is due to the limited knowledge of the branching fractions of χc → J/ψγ modes. © 2013 CERN. Published by Elsevier B.V. All rights reserved.