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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/133074
Observation of Photon Polarization in the b→sγ Transition
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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 .
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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. Observation of Photon Polarization in the b→sγ Transition. _Physical Review Letters_. 2014. Vol. 112, núm. 16, pàgs. 161801. [consulta: 29 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/133074]