Search for T Violation in Charm Meson Decays

Abstract

Using data from the FOCUS (E831) experiment, we have searched for T violation in charm meson decays using the four-body decay channels $D^0\to K^{-}{K}^{+}{\pi }^{-}{\pi }^{+}$, $D^{+}\to K_S^0{K}^{+}{\pi }^{-}{\pi }^{+}$, and $D_s^{+}\to K_S^0{K}^{+}{\pi }^{-}{\pi }^{+}$. The T violation asymmetry is obtained using triple-product correlations and assuming the validity of the CPT theorem. We find the asymmetry values to be $A_{T}viol(D^0)=0.010\pm 0.057(stat.)\pm 0.037(syst.)$, $A_{T}viol(D^{+})=0.023\pm 0.062(stat.)\pm 0.022(syst.)$, and $A_{T}viol(D_s^{+})=-0.036\pm 0.067(stat.)\pm 0.023(syst.)$. Each measurement is consistent with no T violation. New measurements of the CP asymmetries for some of these decay modes are also presented.

17 pages,6 figures,submitted to Phys.Lett.B