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 3fb-1, nearly 14000 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/c2 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→sγ transition is reported with a significance of 5.2σ. © 2014 CERN, for the LHCb Collaboration.

Observation of photon polarization in the b →sγ transition / R., A., B., A., M., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A., A., S., A., S., A., Y., A., L., A., J., A., R., A., M., A., J., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 112:(2014). [10.1103/PhysRevLett.112.161801]

Observation of photon polarization in the b →sγ transition

G. Casse;SARTI, ALESSIO;SCIUBBA, Adalberto;
2014

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 3fb-1, nearly 14000 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/c2 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→sγ transition is reported with a significance of 5.2σ. © 2014 CERN, for the LHCb Collaboration.
2014
High energy physics, Polarization, Tellurium compounds; Center-of-mass energies, Direct observations, Final state, Flavor-changing neutral current, Integrated luminosity, Photon polarization, Proton proton collisions; Photons
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of photon polarization in the b →sγ transition / R., A., B., A., M., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A., A., S., A., S., A., Y., A., L., A., J., A., R., A., M., A., J., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 112:(2014). [10.1103/PhysRevLett.112.161801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/665096
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