Measurements of CP violation in B mixing through $B\to J/\psi X$ decays at LHCb

Abstract

B mesons provide an ideal laboratory for measurements of CP violation and searches for CP violation beyond the Standard Model. Recent measurements of the mixing phases of the $B_s^0$ and $B^0$ mesons, ${\varphi }_s$ and $\sin 2\beta$, using decays to $J/\psi X$ final states are presented. In view of future improved measurements, a good understanding of pollution from sub-leading penguin topologies in these decays is needed. Those can be probed using suppressed decays like $B_s^0\to J/\psi K_S^0$ and $B_s^0\to J/\psi {\overline{K}}^{\ast 0}$. Recent results using these decay modes are presented.

arXiv commentProceedings for EPS-HEP 2015. Updated introduction