Measurement of $CP$ observables in $B^{\pm }\to D^{(\ast )}{K}^{\pm }$ and $B^{\pm }\to D^{(\ast )}{\pi }^{\pm }$ decays

Abstract

Measurements of $CP$ observables in $B^{\pm }\to D^{(\ast )}{K}^{\pm }$ and $B^{\pm }\to D^{(\ast )}{\pi }^{\pm }$ decays are presented, where $D^{(\ast )}$ indicates a neutral $D$ or $D^{\ast }$ meson that is an admixture of $D^{(\ast )0}$ and ${\bar{D}}^{(\ast )0}$ states. Decays of the $D^{\ast }$ meson to the $D{\pi }^0$ and $D\gamma$ final states are partially reconstructed without inclusion of the neutral pion or photon, resulting in distinctive shapes in the $B$ candidate invariant mass distribution. Decays of the $D$ meson are fully reconstructed in the $K^{\pm }{\pi }^{\mp }$, $K^{+}{K}^{-}$ and ${\pi }^{+}{\pi }^{-}$ final states. The analysis uses a sample of charged $B$ mesons produced in $pp$ collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 2.0, 1.0 and 2.0 fb${}^{-1}$ taken at centre-of-mass energies of $\sqrt{s}$ = 7, 8 and 13 TeV, respectively. The study of $B^{\pm }\to D^{\ast }{K}^{\pm }$ and $B^{\pm }\to D^{\ast }{\pi }^{\pm }$ decays using a partial reconstruction method is the first of its kind, while the measurement of $B^{\pm }\to D{K}^{\pm }$ and $B^{\pm }\to D{\pi }^{\pm }$ decays is an update of previous LHCb measurements. The $B^{\pm }\to D{K}^{\pm }$ results are the most precise to date.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-021.html

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