Measurement of the $CP$ asymmetry in $B^-\to D_s^-D^0$ and $B^-\to D^-D^0$ decays

Abstract

The $CP$ asymmetry in $B^-\\to D_s^-D^0$ and $B^-\\to D^-D^0$ decays is measured using LHCb data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, collected in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. The results are $A^{CP}(B^-\\to D_s^-D^0)=(-0.4\\pm 0.5\\pm 0.5)\\%$ and $A^{CP}(B^-\\to D^-D^0)=( 2.3\\pm 2.7\\pm 0.4)\\%$, where the first uncertainties are statistical and the second systematic. This is the first measurement of $A^{CP}(B^-\\to D_s^-D^0)$ and the most precise determination of $A^{CP}(B^-\\to D^-D^0)$. Neither result shows evidence of $CP$ violation.

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