Search for T and CP Violation in B0-B0bar Mixing with inclusive Dileptons Events

The authors report the results of a search for T and CP violation in B0-(bar B)0 mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. The asymmetry between (ell)+(ell)+ and (ell)-(ell)- events allows the authors to compare the probabilities for (bar B)0 → B0 and B0 → (bar B)0 oscillations and thus probe T and CP invariance. Using a sample of 23 million B(bar B) pairs, they measure a same-sign dilepton asymmetry of AT/CP = (0.5 ± 1.2(stat) ± 1.4(syst))%. For the modulus of the ratio of complex mixing parameters p and q, they obtain |q/p| = 0.998 ± 0.006(stat) ± 0.007(syst)