Measurement of the flavour-specific CP-violating asymmetry $a_{\rm sl}^s$ in $B_s^0$ decays

Journal article

The CP-violating asymmetry a_{sl}^s is studied using semileptonic decays of Bs and anti-Bs 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. The reconstructed final states are Ds^(+/-)\mu ^(-/+), with the Ds^(+/-) particle decaying in the \phi\pi^(+/-) mode. The Ds^(+/-)\mu ^{-/+) yields are summed over Bs and anti-Bs initial states, and integrated with respect to decay time. Data-driven methods are used to measure efficiency ratios. We obtain $a_{sl}^s$ = (-0.06 +/- 0.50 +/- 0.36)%, where the first uncertainty is statistical and the second systematic.

Authors: collaboration, L; Aaij, R; Adeva, B; Adinolfi, M; Adrover, C

• Publication status: Published
• Journal: Physics Letters B 728C (2014), pp. 607-615
• Volume: 728
• Issue: 1
• Pages: 607-615
• Publication date: 2013-08-05
• DOI: 10.1016/j.physletb.2013.12.030
• ISSN: 0370-2693
• Keywords: hep-ex