Measurement of $CP$ violation in $B^{0}\rightarrow D^{(*)}D$ decays at LHCb.

Belloli N.
  Martedì 12/09   09:00 - 13:00   Aula A208   I - Fisica nucleare e subnucleare
The measurements of parameters associated with $CP$ Violation in $B^{0}\rightarrow D^{+}D^{-}$ and $B^{0}\rightarrow D^{*}D$ decays are presented. The analysis of the first decay mode is performed on Run I data and the values obtained from a fit to the decay-time distribution of flavour-tagged candidates provide an evidence of $CP$ violation at a significance level of 4.0 standard deviations, allowing to constrain the phase shift due to higher-order SM corrections to the world's most precise value. The analysis of the second decay mode is ongoing with Run I and part of Run II data. Preliminary studies performed on the sensitivity to $CP$ observables show that LHCb can rival the results obtained by previous experiments.