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キーワード:
High Energy Physics - Experiment, hep-ex
MPINP:
LHCb - Abteilung Hofmann
要旨:
We report on measurements of the time-dependent CP violating observables in
$B^0_s\rightarrow D^{\mp}_s K^{\pm}$ decays using a dataset corresponding to
1.0 fb$^{-1}$ of pp collisions recorded with the LHCb detector. We find the CP
violating observables $C_f=0.53\pm0.25\pm0.04$,
$A^{\Delta\Gamma}_f=0.37\pm0.42\pm0.20$,
$A^{\Delta\Gamma}_{\bar{f}}=0.20\pm0.41\pm0.20$, $S_f=-1.09\pm0.33\pm0.08$,
$S_{\bar{f}}=-0.36\pm0.34\pm0.08$, where the uncertainties are statistical and
systematic, respectively. Using these observables together with a recent
measurement of the $B^0_s$ mixing phase $-2\beta_s$ leads to the first
extraction of the CKM angle $\gamma$ from $B^0_s \rightarrow D^{\mp}_s K^{\pm}$
decays, finding $\gamma$ = (115$_{-43}^{+28}$)$^\circ$ modulo 180$^\circ$ at
68% CL, where the error contains both statistical and systematic uncertainties.