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Published February 1, 2016 | Published
Journal Article Open

Search for mixing-induced CP violation using partial reconstruction of B^0→D^(*+)Xℓ^-ν_ℓ and kaon tagging


We describe in detail a previously published measurement of CP violation in B^0-B^0 oscillations, based on an integrated luminosity of 425.7  fb^(−1) collected by the BABAR experiment at the PEPII collider. We apply a novel technique to a sample of about 6 million B^0→D^(*+)ℓ^−ν_ℓ decays selected with partial reconstruction of the D^(*+) meson. The charged lepton identifies the flavor of one B meson at its decay time, the flavor of the other B is determined by kaon tagging. We determine a CP violating asymmetry A_(CP)=(N(B^0B^0)−N(B^0B^0))/(N(B^0B^0)+N(B^0B^0))=(0.06±0.17^(+0.38)_(−0.32))% corresponding to Δ_(CP)=1−|q/p|=(0.29±0.84^(+1.88)_(−1.61))×10^(−3). This measurement is consistent and competitive with those obtained at the B factories with dilepton events.

Additional Information

© 2016 American Physical Society. Received 8 June 2015; revised manuscript received 23 December 2015; published 8 February 2016. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l'Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Economia y Competitividad (Spain), the Science and Technology Facilities Council (United Kingdom) and the Binational Science Foundation (U.S.-Israel). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation (USA).

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Published - PhysRevD.93.032001.pdf


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