D? EVIDENCE FOR CP VIOLATION AND IMPLICATION FOR CPT VIOLATION IN B-MESON MIXING

摘要

A D? analysis measuring the charge asymmetry A_(sl)~b of like-sign dimuon events due to semileptonic b-hadron decays at the Fermilab Tevatron Collider is described. It differs by 3.2 standard deviations from the Standard Model prediction to provide first evidence of CPT-invariant anomalous CP violation in the mixing of neutral B mesons, and is compared to the CP-violating phase obtained from a D? analysis of the time-dependent decay angles in B_s~0 → J/ΨФ. If CPT violation is allowed, the dimuon asymmetry also yields the first sensitivity to CPT violation in the B_s~0 system.