Measurement of CP violation in $B_s^0\to \varphi \varphi$ decays

Abstract

A measurement of the decay time dependent CP-violating asymmetry in $B_s^0\to \varphi \varphi$ decays is presented, along with measurements of the $T$-odd triple-product asymmetries. In this decay channel, the CP-violating weak phase arises from the interference between $B_s^0$-${\bar{B}}_s^0$ mixing and the loop-induced decay amplitude. Using a sample of proton-proton collision data corresponding to an integrated luminosity of $3.0f{b}^{-1}$ collected with the LHCb detector, a signal yield of approximately 4000 $B_s^0\to \varphi \varphi$ decays is obtained. The CP-violating phase is measured to be ${\varphi }_s=-0.17\pm 0.15(\mathrm{stat})\pm 0.03(\mathrm{syst})$ rad. The triple-product asymmetries are measured to be $A_U=-0.003\pm 0.017(\mathrm{stat})\pm 0.006(\mathrm{syst})$ and $A_V=-0.017\pm 0.017(\mathrm{stat})\pm 0.006(\mathrm{syst})$. Results are consistent with the hypothesis of CP conservation.

arXiv comment19 pages, 7 figures, updated to published version

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