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Measurement of the $CP$ asymmetry in $B^0_s -\overline B {^0 _s}$ mixing

The $CP$ asymmetry in the mixing of $B_s^0$ and $\overline{B}{}_s^0$ mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Semileptonic $B_s^0$ and $\overline{B}{}_s^0$...

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Wilkinson, Michael, Williams, Mark Richard James, Williams, Matthew, Williams, Mike, Williams, Timothy, Wilson, Fergus, Wimberley, Jack, Wishahi, Julian, Wislicki, Wojciech, Witek, Mariusz, Wormser, Guy, Wotton, Stephen, Wraight, Kenneth, Wright, Simon, Wyllie, Kenneth, Xie, Yuehong, Xing, Zhou, Xu, Zhirui, Yang, Zhenwei, Yin, Hang, Yu, Jiesheng, Yuan, Xuhao, Yushchenko, Oleg, Zangoli, Maria, Zarebski, Kristian Alexander, Zavertyaev, Mikhail, Zhang, Liming, Zhang, Yanxi, Zhang, Yu, Zhelezov, Alexey, Zheng, Yangheng, Zhokhov, Anatoly, Zhukov, Valery, Zucchelli, Stefano
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.117.061803
https://dx.doi.org/10.1103/PhysRevLett.118.129903
http://cds.cern.ch/record/2157071
Descripción
Sumario:The $CP$ asymmetry in the mixing of $B_s^0$ and $\overline{B}{}_s^0$ mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Semileptonic $B_s^0$ and $\overline{B}{}_s^0$ decays are studied in the inclusive mode $D_s^{\mp} \mu^{\pm} {^(}\overline {\nu} {^)} _{\mu} X$ with the $D_s^{\mp}$ mesons reconstructed in the $K^+ K^- \pi^{\mp}$ final state. Correcting the observed charge asymmetry for detection and background effects, the $CP$ asymmetry is found to be $a_{\text{sl}}^s = (0.39 \pm 0.26 \pm 0.20) \% $, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of $a_{\text{sl}}^s$ to date, and is consistent with the prediction from the Standard Model of particle physics.