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Title: | Observation of Photon Polarization in the b→sγ Transition |
Author: | Badalov, Alexey Calvo Gómez, Míriam Camboni, Alessandro Comerma Montells, Albert Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Oyanguren Campos, Arantza de Picatoste Olloqui, Eduardo Potterat, Cédric Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) Ruiz Valls, Pablo Vilasis-Cardona, Xavier LHCb Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 22-Apr-2014 |
Publisher: | American Physical Society |
Abstract: | This Letter presents a study of the flavor-changing neutral current radiative B ± → K ± π ∓ π ± γ decays performed using data collected in proton-proton collisions with the LHCb detector at 7 and 8 TeV center-of-mass energies. In this sample, corresponding to an integrated luminosity of 3 fb − 1 , nearly 14 000 signal events are reconstructed and selected, containing all possible intermediate resonances with a K ± π ∓ π ± final state in the [ 1.1 , 1.9 ] GeV / c 2 mass range. The distribution of the angle of the photon direction with respect to the plane defined by the final-state hadrons in their rest frame is studied in intervals of K ± π ∓ π ± mass and the asymmetry between the number of signal events found on each side of the plane is obtained. The first direct observation of the photon polarization in the b → s γ transition is reported with a significance of 5.2 σ . |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.112.161801 |
It is part of: | Physical Review Letters, 2014, vol. 112, num. 16, p. 161801 |
URI: | http://hdl.handle.net/2445/133074 |
Related resource: | https://doi.org/10.1103/PhysRevLett.112.161801 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) |
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