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

Abstract

We present a measurement of the direct $CP$-violating charge asymmetry in $D_s^{\pm }\to \varphi {\pi }^{\pm }$ decays where the $\varphi$ 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. Updated to include changes made after referees comments. Corrected an affiliation in the author list.

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

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• PYTHIA 6.4 Physics and Manual
• Study of CP-violating charge asymmetries of single muons and like-sign dimuons in p pbar collisions
• Measurement of the flavour-specific CP-violating asymmetry $a_{\mathrm{sl}}^s$ in $B_s^0$ decays
• Measurement of the Ds+ - Ds- production asymmetry in 7 TeV pp collisions
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Cited by in corpus (3)

• Measurement of $CP$ asymmetries in $D^{\pm }\to {\eta }^{\prime }{\pi }^{\pm }$ and $D_s^{\pm }\to {\eta }^{\prime }{\pi }^{\pm }$ decays
• Measurement of the direct CP-violating parameter A_CP in the decay D+ -> K- pi+ pi+
• Review of Physics Results from the Tevatron: Heavy Flavor Physics