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Differential Branching Fraction and Angular Analysis of the Decay B-0 -> K*(0)mu(+)mu(-)

By Carlos Abellan Beteta, M. Calvo Gómez, Alessandro Camboni, Albert Comerma Montells, F. Domingo Bonal, Lluís Garrido Beltrán, David Gascón Fora, Marc Grabalosa Gándara, Ricardo Graciani Díaz, Eugeni Graugés Pous, E. Lopez Asamar, Marco Musy, Antonio Pérez-Calero Yzquierdo, Eduardo Picatoste Olloqui, B. (Blai) Pie Valls, Cédric Potterat, Albert Puig Navarro, M. Roselló, Hugo (Ruiz Pérez) Ruiz, R. Vázquez Gómez, X. Vilasis-Cardona and LHCb Collaboration


The angular distributions and the partial branching fraction of the decay B0→K*0μ+μ− are studied by using an integrated luminosity of 0.37  fb−1 of data collected with the LHCb detector. The forward-backward asymmetry of the muons, AFB, the fraction of longitudinal polarization, FL, and the partial branching fraction dB/dq2 are determined as a function of the dimuon invariant mass. The measurements are in good agreement with the standard model predictions and are the most precise to date. In the dimuon invariant mass squared range 1.00-6.00  GeV2/c4, the results are AFB=−0.06+0.13−0.14±0.04, FL=0.55±0.10±0.03, and dB/dq2=(0.42±0.06±0.03)×10−7  c4/GeV2. In each case, the first error is statistical and the second systematic

Topics: Detectors de radiació, Partícules (Física nuclear), Nuclear counters, Particles (Nuclear physics)
Publisher: American Physical Society
Year: 2014
DOI identifier: 10.1103/PhysRevLett.108.181806
OAI identifier:

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