非表示:
キーワード:
High Energy Physics - Experiment, hep-ex
MPINP:
LHCb - Abteilung Hofmann
要旨:
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.