Measurement of $γ$ from $B \rightarrow DK$ decays at LHCb

We report results from the first measurements of the CKM angle $γ$ using $B\rightarrow DK$ decays with the LHCb experiment. Three well established methods are used to extract the CP observables. The updated measurement of $γ$ in the three-body $D^0$ Dalitz space results in $γ= (57\pm 16)^\circ$. When combining the observables from all \bdk studies, the best fit value for $γ\in [0,180]^\circ$ is $γ= 67.2^\circ$ with $γ\in [55.1,79.1]^\circ$ at 68%CL and $γ\in [43.9, 89.5]^\circ$ at 95%CL. This represents the most precise $γ$ values directly measured by a single experiment. Furthermore, a new time-dependent approach using $B_s \rightarrow D_s K$ decays is used for the first time to measure CP observables and future prospects for $γ$ at LHCb are given.

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