Measurement of $CP$ asymmetry in $B_s^0\to D_s^{\mp }{K}^{\pm }$ decays

Abstract

We report the measurements of the $CP$-violating parameters in $B_s^0\to D_s^{\mp }{K}^{\pm }$ decays observed in $pp$ collisions, using a data set corresponding to an integrated luminosity of $3.0{\text{fb}}^{-1}$ recorded with the LHCb detector. We measure $C_f=0.73\pm 0.14\pm 0.05$, $A_f^{\Delta \Gamma }=0.39\pm 0.28\pm 0.15$, $A_{\overline{f}}^{\Delta \Gamma }=0.31\pm 0.28\pm 0.15$, $S_f=-0.52\pm 0.20\pm 0.07$, $S_{\overline{f}}=-0.49\pm 0.20\pm 0.07$, where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the $B_s^0$ mixing phase, $-2{\beta }_s$, to obtain a measurement of the CKM angle $\gamma$ from $B_s^0\to D_s^{\mp }{K}^{\pm }$ decays, yielding $\gamma =(128{}_{-22}^{+17}{)}^{\circ }$ modulo $180^{\circ }$, where the uncertainty contains both statistical and systematic contributions. This corresponds to $3.8\sigma$ evidence for $CP$ violation in the interference between decay and decay after mixing.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-047.html

References in corpus (3)

• PYTHIA 6.4 Physics and Manual
• Boosted Decision Trees as an Alternative to Artificial Neural Networks for Particle Identification
• Exploring $B_s\to D_s^{(\ast )\pm }{K}^{\mp }$ Decays in the Presence of a Sizable Width Difference $\Delta {\Gamma }_s$

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