Speaker
Paul Seyfert
(Universita & INFN, Milano-Bicocca (IT))
Description
Measurements of CP violation in neutral B mesons mixing and in the interference with decays are excellent probes to search for physics beyond the Standard Model.
We present a selection of recent measurements performed by the LHCb experiment using the full Run 1 dataset. Among these:
the measurement of the semileptonic asymmetries, Asls and Asld, the measurements of the mixing-induced CP-violating phase $\phi_s$ in the $B^0_s - \bar B^0_s$ system using $B^0_s \to J/\psi hh$ (where $h = K$ or $\pi$) and $B^0_s \to D_s^+ D_s^-$ decays, as well as several other modes including $B^0_s \to \psi(2S) \phi$.
A good understanding of the pollution from sub-leading penguin topologies in the reference decay channels for the $\phi_s$ and $\sin 2\beta$ measurements can be achieved by measuring CP violation and polarization in the decay $B^0_s \to J/\psi K^*$, CP violation and branching fraction of the decay $B^+ \to J/\psi \pi^+$ and time dependent CP violation in $B^0_s \to J/\psi K^0_S$. These results together with constraints from $B^0 \to J/\psi \rho^0$ are used to put bounds on penguin pollution to $\phi_s$ and $\sin 2\beta$ measurements.
