Angular analysis and branching fraction measurement of the decay B0 → K∗0μ+μ−

Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Erö, J. and Fabjan, C. and Friedl, M. and Frühwirth, R. and Ghete, V. M. and Hörmann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knünz, V. and Krammer, M. and Krätschmer, I. and Liko, D. and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Molnár, József and Pálinkás, József and Karancsi, János and Trócsányi, Zoltán and Ujvári, Balázs and Krajczár, Krisztián and Veres, Gábor (2013) Angular analysis and branching fraction measurement of the decay B0 → K∗0μ+μ−. PHYSICS LETTERS B, 727 (1-3). pp. 77-100. ISSN 0370-2693

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Abstract

The angular distributions and the differential branching fraction of the decay B0 → K∗(892)0μ+μ− are studied using a data sample corresponding to an integrated lu- minosity of 5.2 fb−1 collected with the CMS detector at the LHC in pp collisions at√s = 7 TeV. From more than 400 signal decays, the forward-backward asymme- try of the muons, the K∗(892)0 longitudinal polarization fraction, and the differential branching fraction are determined as a function of the square of the dimuon invariant mass. The measurements are in good agreement with standard model predictions.

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