First study of the CP-violating phase and decay-width difference in $B_s^0\toÏ(2S)Ï$ decays
arXiv:1608.04855 · doi:10.1016/j.physletb.2016.09.028
Abstract
A time-dependent angular analysis of $B_s^0\toÏ(2S)Ï$ decays is performed using data recorded by the LHCb experiment. The data set corresponds to an integrated luminosity of 3.0\invfb collected during Run 1 of the LHC. The CP-violating phase and decay-width difference of the $B_s^0$ system are measured to be $Ï_s = 0.23^{+0.29}_{-0.28} \pm 0.02$ rad and $ÎÎ_s = 0.066^{+0.041}_{-0.044} \pm 0.007$ ps$^{-1}$, respectively, where the first uncertainty is statistical and the second systematic. This is the first time that $Ï_s$ and $ÎÎ_s$ have been measured in a decay containing the $Ï(2S)$ resonance.
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-2016-027.html