Measurement of $CP$ violation in $B^0\to D^{\mp }{\pi }^{\pm }$ decays

Abstract

A measurement of the $CP$ asymmetries $S_f$ and $S_{\bar{f}}$ in $B^0\to D^{\mp }{\pi }^{\pm }$ decays is reported. The decays are reconstructed in a dataset collected with the LHCb experiment in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV and corresponding to an integrated luminosity of $3.0{\mathrm{fb}}^{-1}$. The $CP$ asymmetries are measured to be $S_f=0.058\pm 0.020(\mathrm{stat})\pm 0.011(\mathrm{syst})$ and $S_{\bar{f}}=0.038\pm 0.020(\text{stat})\pm 0.007(\text{syst})$. These results are in agreement with, and more precise than, previous determinations. They are used to constrain $|\sin \left(2\beta +\gamma \right)|$ and $\gamma$ to intervals that are consistent with the current world-average values.

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-2018-009.html

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