Updated Measurement of \cal B(B_s → D_s^(*)+D_s^(*)-) and Determination of ΔΓ_s

2011/10/10 by Esen, Sevda
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.1110.2099

Abstract

Using fully reconstructed B_s mesons, we measure exclusive branching fractions for the decays B_s → D_s^(*)+D_s^(*)-. The results are \cal B(B⁰_s\ra D⁺_s D^-_s)=(0.58 ^+0.11_-0.09 ± 0.13)%, \cal B(B⁰_s\ra D^*±_s D^∓_s)=(1.8 ± 0.2 ± 0.4)%, and \cal B(B⁰_s\ra D^*+_s D^*-_s)=(2.0 ± 0.3 ± 0.5)%; the sum is \cal B(B⁰_s\ra D^(*)+_s D^(*)-_s)=(4.3 ± 0.4 ± 1.0)%. Assuming these decay modes saturate decays to CP-even final states, the branching fraction determines the relative width difference between the B_s CP-odd and CP-even eigenstates. Taking \cp violation to be negligibly small, we obtain \dgs/\gs = 0.090 ± 0.009 \rm(stat.) ± 0.022 \rm (syst.), where \gs is the mean decay width. The results are based on a data sample collected with the Belle detector at the KEKB e⁺ e^- collider running at the Υ(5S) resonance with an integrated luminosity of 121.4 fb^-1.

Related

• Measurement of the inclusive branching fractions for B_s⁰ decays into D mesons via hadronic tagging
• Measurement of B -> D_s K pi branching ratios
• Measurement of the branching fraction \cal B( B⁰→ D^*+ℓ^-ν_ℓ) with early Belle II data
• DeltaGamma_s Measurement at the Upsilon(5S) from Belle
• Observation of B→ D^(*) K^- K⁰_S decays using the 2019-2022 Belle II data sample