| Resumen |
We present a measurement of the direct CP-violating charge asymmetry in Ds+→φπ± decays where the φ meson decays to K+K-, using the full Run II data set with an integrated luminosity of 10.4fb-1 of proton-antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. The normalized difference ACP in the yield of Ds+ and Ds- mesons in these decays is measured by fitting the difference between their reconstructed invariant mass distributions. This results in an asymmetry of ACP=[-0.38±0.27]%, 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. |
