Abstract
We report a measurement of the branching fraction of the decay Bs0→J/ψϕ(1020), evidence and a branching fraction measurement for Bs0→J/ψf2′(1525), and the determination of the total Bs0→J/ψK+K− branching fraction, including the resonant and nonresonant contributions to the K+K− channel. We also determine the S-wave contribution within the ϕ(1020) mass region. The absolute branching fractions are B[Bs0→J/ψϕ(1020)]=(1.25±0.07(stat)±0.08(syst)±0.22(fs))×10−3, B[Bs0→J/ψf2′(1525)]=(0.26±0.06(stat)±0.02(syst)±0.05(fs))×10−3, and B[Bs0→J/ψK+K−]=(1.01±0.09(stat)±0.10(syst)±0.18(fs))×10−3, where the last systematic error is due to the branching fraction of bb¯→Bs(*)Bs(*). The branching fraction ratio is found to be B[Bs0→J/ψf2′(1525)]/B[Bs0→J/ψϕ(1020)]=(21.5±4.9(stat)±2.6(syst))%. All results are based on a 121.4 fb−1 data sample collected at the Υ(5S) resonance by the Belle experiment at the KEKB asymmetric-energy e+e− collider.Received 3 September 2013DOI:https://doi.org/10.1103/PhysRevD.88.114006© 2013 American Physical Society
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