Measurement of the CKM angle $γ$ from a combination of LHCb results

Abstract

A combination of measurements sensitive to the CKM angle $γ$ from LHCb is performed. The inputs are from analyses of time-integrated $B^{+}\rightarrow DK^+$, $B^{0} \rightarrow D K^{*0}$, $B^{0} \rightarrow D K^+ π^-$ and $B^{+} \rightarrow D K^+π^+π^-$ tree-level decays. In addition, results from a time-dependent analysis of $B_{s}^{0} \rightarrow D_{s}^{\mp}K^{\pm}$ decays are included. The combination yields $γ= (72.2^{+6.8}_{-7.3})^\circ$, where the uncertainty includes systematic effects. The 95.5% confidence level interval is determined to be $γ\in [55.9,85.2]^\circ$. A second combination is investigated, also including measurements from $B^{+} \rightarrow D π^+$ and $B^{+} \rightarrow D π^+π^-π^+$ decays, which yields compatible results.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-032.html