Measurement of the flavour-specific CP-violating asymmetry a[s over sl] in B[0 over s] decays
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The CP -violating asymmetry a[s over ls] is studied using semileptonic decays of B[0 over s] and [¯ over B][0 over s] mesons produced in pp collisions at a centre-of-mass energy of 7 TeV at the LHC, exploiting a data sample corresponding to an integrated luminosity of 1.0 fb[superscript −1]. The reconstructed final states are D[± over s]μ[superscript ∓], with the D[± over s] particle decaying in the ϕπ[superscript ±] mode. The D[± over s]μ[superscript ∓] yields are summed over [¯ over B][0 over s] and B[0 over s] initial states, and integrated with respect to decay time. Data-driven methods are used to measure efficiency ratios. We obtain a[s over ls] = (−0.06±0.50±0.36)%, where the first uncertainty is statistical and the second systematic.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physics Letters B
Aaij, R. et al. “Measurement of the Flavour-Specific CP-Violating Asymmetry a[s over sl] in B[0 over s] Decays.” Physics Letters B 728 (January 2014): 607–615.
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