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

TL;DR

This paper reports the first measurement of $CP$ asymmetry in $B^- o D_s^-D^0$ decays and provides the most precise measurement for $B^- o D^-D^0$, using LHCb data at 7 and 8 TeV, finding no evidence of $CP$ violation.

Contribution

It presents the first measurement of $A^{CP}(B^- o D_s^-D^0)$ and the most precise measurement of $A^{CP}(B^- o D^-D^0)$, improving the understanding of $CP$ violation in these decays.

Findings

$A^{CP}(B^- o D_s^-D^0)=(-0.4 extpm 0.5 extpm 0.5)\%$

$A^{CP}(B^- o D^-D^0)=( 2.3 extpm 2.7 extpm 0.4)\%$

No evidence of $CP$ violation found.

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.