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American Physical Society, Physical Review Letters, 23(88)

DOI: 10.1103/physrevlett.88.231801

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Search forTandCPViolation inB0−B¯0Mixing with Inclusive Dilepton Events

Journal article published in 2002 by B. Aubert, D. Boutigny, J.-M. Gaillard, A. Hicheur, Y. Karyotakis, J. P. Lees, P. Robbe, V. Tisserand, A. Zghiche, A. Palano, A. Pompili, G. P. Chen, J. C. Chen, N. D. Qi, G. Rong and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We report the results of a search for T and CP violation in B0-anti-B0 mixing using an inclusive dilepton sample collected by the BaBar experiment at the PEP-II B Factory. The asymmetry between (l+,l+) and (l-,l-) events allows us to compare the probabilities P(anti-B0 -> B0) and P(B0 -> anti-B0) oscillations and thus probe T and CP invariance. Using a sample of 23 million B-anti-B pairs, we measure a same-sign dilepton asymmetry of A_(T/CP)=(0.5 +- 1.2(stat) +- 1.4(syst))%. For the modulus of the ratio of complex mixing parameters p and q, we obtain |q/p| = 0.998 +- 0.006(stat) +- 0.007(syst). ; Comment: 7 pages, 3 figures, submitted to Physical Review Letters