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

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.
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Submitted on : Wednesday, December 4, 2013 - 7:38:37 AM
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V.M. Abazov, F. Badaud, G. Bernardi, D. Brown, Y. Enari, et al.. Measurement of the direct $CP$-violating charge asymmetry in ${D_s^\pm \rightarrow \phi \pi^{\pm}}$ decays. Physical Review Letters, American Physical Society, 2014, 112, pp.111804. ⟨10.1103/PhysRevLett.112.111804⟩. ⟨in2p3-00913572⟩



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