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

Abstract : 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00926665
Contributor : Danielle Cristofol <>
Submitted on : Friday, January 10, 2014 - 8:59:00 AM
Last modification on : Thursday, February 25, 2021 - 10:58:19 AM

### Citation

R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, et al.. Measurement of the flavour-specific CP-violating asymmetry $a_{\rm sl}^s$ in $B_s^0$ decays. Physics Letters B, Elsevier, 2014, 728, pp.607-615. ⟨10.1016/j.physletb.2013.12.030⟩. ⟨in2p3-00926665⟩

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