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Published February 27, 2015 | Published + Submitted
Journal Article Open

Study of CP Asymmetry in B^0-B^0 Mixing with Inclusive Dilepton Events


We present a measurement of the asymmetry ACP between same-sign inclusive dilepton samples ℓ^+ℓ^+ and ℓ^−ℓ^− (ℓ=e, μ) from semileptonic B decays in Υ(4S)→BB events, using the complete data set recorded by the BABAR experiment near the Υ(4S) resonance, corresponding to 471×10^6 BB pairs. The asymmetry ACP allows comparison between the mixing probabilities P(B^0→B^0) and P(B^0→B^0), and therefore probes CP and T violation. The result, A_(CP)=[−3.9±3.5(stat)±1.9(syst)]×10^(−3), is consistent with the standard model expectation.

Additional Information

© 2015 American Physical Society. Received 10 November 2014; published 25 February 2015. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (U.S.), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (Netherlands), NFR (Norway), MES (Russia), MINECO (Spain), STFC (United Kingdom), and BSF (U.S.-Israel). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation (U.S.).

Attached Files

Published - PhysRevLett.114.081801.pdf

Submitted - 1411.1842v1.pdf


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