| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1852690 | Physics Letters B | 2015 | 11 Pages |
The decay B‾s0→ψ(2S)K+π− is observed using a data set corresponding to an integrated luminosity of 3.0 fb−13.0 fb−1 collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. The branching fraction relative to the B0→ψ(2S)K+π−B0→ψ(2S)K+π− decay mode is measured to beB(B‾s0→ψ(2S)K+π−)B(B0→ψ(2S)K+π−)=5.38±0.36(stat)±0.22(syst)±0.31(fs/fd)%, where fs/fdfs/fd indicates the uncertainty due to the ratio of probabilities for a b quark to hadronise into a Bs0 or B0B0 meson. Using an amplitude analysis, the fraction of decays proceeding via an intermediate K⁎(892)0K⁎(892)0 meson is measured to be 0.645±0.049(stat)±0.049(syst) and its longitudinal polarisation fraction is 0.524±0.056(stat)±0.029(syst). The relative branching fraction for this component is determined to beB(B‾s0→ψ(2S)K⁎(892)0)B(B0→ψ(2S)K⁎(892)0)=5.58±0.57(stat)±0.40(syst)±0.32(fs/fd)%. In addition, the mass splitting between the Bs0 and B0B0 mesons is measured asM(Bs0)−M(B0)=87.45±0.44(stat)±0.09(syst) MeV/c2.
