First study of the CP-violating phase and decay-width difference in $B_s^0\to \psi (2S)\varphi$ decays

Abstract

A time-dependent angular analysis of $B_s^0\to \psi (2S)\varphi$ 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 ${\varphi }_s=0.23_{-0.28}^{+0.29}\pm 0.02$ rad and $\Delta {\Gamma }_s=0.066_{-0.044}^{+0.041}\pm 0.007$ ps${}^{-1}$, respectively, where the first uncertainty is statistical and the second systematic. This is the first time that ${\varphi }_s$ and $\Delta {\Gamma }_s$ have been measured in a decay containing the $\psi (2S)$ resonance.

arXiv commentAll 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

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