Measurement of the direct CP violating charge asymmetry in $B^\pm \rightarrow \mu^\pm \nu_\mu D^{0}$ decays

TL;DR

This paper reports the first measurement of CP violation in $B^\pm o \mu^\pm u_\mu D^0$ decays, using Tevatron data, finding results consistent with the Standard Model.

Contribution

It provides the first experimental measurement of CP asymmetry in these specific B meson decays, using a large dataset from the Tevatron collider.

Findings

Measured asymmetry $A^{\mu D^0} = -0.14 \pm 0.20\\%$, consistent with zero.

Used invariant mass fits to determine B meson charge asymmetry.

Utilized 10.4 fb$^{-1}$ of proton-antiproton collision data.

Abstract

We present the first measurement of the CP violating charge asymmetry in $B^\pm \to \mu^\pm \nu_\mu {D}^0$ decays using the full Run II integrated luminosity of 10.4 fb$^{-1}$ in proton-antiproton collisions collected with the D0 detector at the Fermilab Tevatron Collider. We measure a difference in the yield of $B^-$ and $B^+$ mesons in these decays by fitting the reconstructed invariant mass distributions. This results in an asymmetry of $A^{\mu D^{0}} =\left[ -0.14 \pm 0.20 \right]\%$, which is consistent with standard model predictions.