Search for CP Violation in B0B0bar Mixing Using Partial Reconstruction of B0-->D*-Xl+ nu and a Kaon Tag.

摘要

Experiments at B factories have observed CP violation in direct B0 decays [1] and in the interference between B0 mixing and decay [2]. CP violation in mixing has so far eluded observation. The weak-Hamiltonian eigenstates are related to the avor eigenstates of the strong interaction Hamiltonian by jBL;Hi = pjB0i qjB0i. The value of the ratio jq=pj can be determined from the asymmetry between the two oscillation probabilities P = P(B0 ! B0) and P = P(B0 ! B0) through ACP = ( P ?? P)=( P + P) = 1jq=pj4 1+jq=pj4 2CP , where CP = 1 ?? jq=pj and the Standard Model (SM) prediction is ACP = ??(4:0 0:6) 104 [3]. Any observation with the present experimental sensitivity (O(103)) w