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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
Particle physics
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:
It is part of: Physical Review Letters, 2014, vol. 112, num. 16, p. 161801
Related resource:
ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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