Measurement of angular asymmetries in the decays B → K*ℓ^+ℓ^−
We study the lepton forward-backward asymmetry A_(FB) and the longitudinal K* polarization F_L, as well as an observable P_2 derived from them, in the rare decays B→K*ℓ^+ ℓ^−, where ℓ^+ ℓ^− is either e^+e^− or μ^+μ^−, using the full sample of 471 million BB events collected at the Υ(4S) resonance with the BABAR, detector at the PEP-II e^+e^− collider. We separately fit and report results for the K*0(892)ℓ^+ℓ^− and K*^+(892)ℓ^+ℓ^− final states, as well as their combination K*ℓ^+ℓ^−, in five disjoint dilepton mass-squared bins. An angular analysis of B^+ →K*+ℓ^+ ℓ^− decays is presented here for the first time.
Additional Information© 2016 American Physical Society. Received 1 September 2015; published 28 March 2016. We would like to express our gratitude to Joaquim Matias for discussions regarding the observable P2. 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 the 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 Economía 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).
Published - PhysRevD.93.052015.pdf
Submitted - 1508.07960v1.pdf