Ponente
Prof.
et al. D0 Collaboration
(Fermi National Accelerator Laboratory)
Descripción
We present two recent measurements of direct CP-violation parameters in charm meson decay, using 10.4 fb-1 of proton-antiproton collisions collected by the D0 detector during Run II at the Fermilab Tevatron Collider. We extract the asymmetry in decay widths for the positively and negatively charged cases of D_s -> phi pi (with phi -> K+K-) and $D -> K pi pi. In both cases, we determine the raw charge asymmetry by simultaneous fits of the appropriate invariant mass distribution. We then correct for detector asymmetries using data-driven methods, and account for any possible asymmetries from CP-violation in B meson decays using simulation, to determine the underlying direct CP-violation parameters. In both cases, we report world-leading precision on these quantities. In addition, we test for Lorentz invariance by extracting the semileptonic mixing asymmetry in B_s^0 mesons, a^s_sl as a function of sidereal time, and fitting the resulting distribution to an oscillatory model. We search for detector-related asymmetries using a periodogram method, and set world-leading limits on relevant CPT-violation parameters.
Autor primario
Prof.
et al. D0 Collaboration
(Fermi National Accelerator Laboratory)
