/ hep-ex FERMILAB-PUB-13-550-E

Measurement of the direct $CP$-violating charge asymmetry in ${D_s^\pm \rightarrow \phi \pi^{\pm}}$ decays

Pages: 6

Abstract: We present a measurement of the direct $CP$-violating charge asymmetry in $D_s^\pm \to \phi \pi^{\pm}$ decays where the $\phi$ meson decays to $K^+K^-$, using the full Run II data set with an integrated luminosity of 10.4 fb$^{-1}$ of proton-antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. The normalised difference $A_{CP}$ in the yield of $D_s^+$ and $D_s^-$ mesons in these decays is measured by fitting the difference between their reconstructed invariant mass distributions. This results in an asymmetry of $A_{CP} =\left[ -0.38 \pm 0.27 \right]\%$, which is the most precise measurement of this quantity to date. The result is consistent with the standard model prediction of zero $CP$ asymmetry in this decay.

Note: 6 pages, 2 figures, submitted to Phys. Rev. Lett

Total numbers of views: 2600
Numbers of unique views: 1044