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- W2768746030 abstract "We report a study of T and CP violation in $B^0$-$overline B^0$ mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II $B$ Factory. The asymmetry between $ell^+ell^+$ and $ell^-ell^-$ allows us to compare the probabilities for $overline B^0 to B^0$ and $B^0 to overline B^0$ oscillations and thus probe T and CP invariance. A sample of 20,381 same-sign dilepton events is selected in the 1999--2000 data sample, corresponding to an integrated luminosity of 20.7 fb$^{-1}$ on the $Upsilon(4S)$ resonance. We measure a same-sign dilepton asymmetry of $A_T=(0.5pm 1.2pm 1.4)%$; for the parameter $epsilon_b$ representing T and CP violations in mixing, we obtain a preliminary result of $$ frac{{mathrm Re}(epsilon_b)}{1+|epsilon_b|^2} = (1.2pm 2.9pm 3.6) times 10^{-3}. $$" @default.
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