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Observation of Photon Polarization in the b -> s gamma Transition

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Observation of Photon Polarization in the b -> s gamma Transition

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dc.contributor.author LHCb Collaboration
dc.contributor.author Martínez Vidal, Fernando
dc.contributor.author Oyanguren Campos, Arantza
dc.contributor.author Ruiz Valls, Pablo
dc.date.accessioned 2016-04-19T12:15:17Z
dc.date.available 2016-04-19T12:15:17Z
dc.date.issued 2014
dc.identifier.citation LHCb Collaboration Martínez Vidal, Fernando Oyanguren Campos, Arantza Ruiz Valls, Pablo 2014 Observation of Photon Polarization in the b -> s gamma Transition Physical Review Letters 112 16 161801-1 161801-8
dc.identifier.uri http://hdl.handle.net/10550/52823
dc.description.abstract This Letter presents a study of the flavor-changing neutral current radiative B-+/- -> K-+/-pi(-/+)pi(+/-)gamma 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-+/-pi(-/+)pi(+/-) 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-+/-pi(-/+)pi(+/-) 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(gamma) transition is reported with a significance of 5.2 sigma.
dc.language.iso eng
dc.relation.ispartof Physical Review Letters, 2014, vol. 112, num. 16, p. 161801-1-161801-8
dc.subject Física nuclear
dc.title Observation of Photon Polarization in the b -> s gamma Transition
dc.type journal article es_ES
dc.date.updated 2016-04-19T12:15:17Z
dc.identifier.doi 10.1103/PhysRevLett.112.161801
dc.identifier.idgrec 099497
dc.rights.accessRights open access es_ES

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