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oai:recercat.cat:2445/1330742025-11-21T05:51:48Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Badalov, Alexey author Calvo Gómez, Míriam author Camboni, Alessandro author Comerma Montells, Albert author Garrido Beltrán, Lluís author Gascón Fora, David author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author Marin Benito, Carla author Oyanguren Campos, Arantza de author Picatoste Olloqui, Eduardo author Potterat, Cédric author Rives Molina, Vicente José author Ruiz, Hugo (Ruiz Pérez) author Ruiz Valls, Pablo author Vilasis-Cardona, Xavier author LHCb Collaboration author 2019-05-13T11:44:52Z 2019-05-13T11:44:52Z 2014-04-22 2019-05-13T11:44:52Z 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 . Física de partícules Experiments Particle physics Experiments Observation of Photon Polarization in the b→sγ Transition