Search for $CP$ violation in $B_s^0$ mixing at LHCb

Abstract

One of the main goals of the LHCb experiment is to determine the mixing-induced $CP$ violating phase ${\varphi }_s$ in $b\to c\bar{c}s$ transitions. Assuming the Standard Model, ${\varphi }_s$ is precisely predicted, hence new physics could easily affect the measurement. The most precise single measurement using $B_s^0\to J/\psi K^{+}{K}^{-}$ data collected in 2015 and 2016 is presented along with a total combined value including all LHCb ${\varphi }_s^{c\bar{c}s}$ analyses. The result is further combined with Tevatron and other LHC experimental results.

Contribution to the 2019 EW session of the 54th Rencontres de Moriond

References in corpus (4)

• Measurement of the CP-violating phase ${\varphi }_s$ in ${\overline{B}}_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• sFit: a method for background subtraction in maximum likelihood fit
• Flavour tagged time dependent angular analysis of the $B_s\to J/\psi \varphi$ decay and extraction of $\Delta \Gamma$ and the weak phase ${\varphi }_s$ in ATLAS
• First study of the CP-violating phase and decay-width difference in $B_s^0\to \psi (2S)\varphi$ decays