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Measurement of the Direct CP-violating Charge Asymmetry in D±s→ϕπ± Decays

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Article number111804
<mark>Journal publication date</mark>21/03/2014
<mark>Journal</mark>Physical Review Letters
Number of pages8
<mark>Original language</mark>English


We present a measurement of the direct CP-violating charge asymmetry in D+s→ϕπ± decays where the ϕ 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 normalized difference ACP 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 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.