The polarization of photons produced in radiative Bs0 decays is studied for the first time. The data are recorded by the LHCb experiment in pp collisions corresponding to an integrated luminosity of 3 fb-1 at center-of-mass energies of 7 and 8 TeV. A time-dependent analysis of the Bs0âÏγ decay rate is conducted to determine the parameter AÎ, which is related to the ratio of right- over left-handed photon polarization amplitudes in bâsγ transitions. A value of AÎ=-0.98-0.52+0.46-0.20+0.23 is measured. This result is consistent with the standard model prediction within 2 standard deviations.
First Experimental Study of Photon Polarization in Radiative Bs0 Decays
De Serio, M.;Pappagallo, M.;Simone, S.;
2017-01-01
Abstract
The polarization of photons produced in radiative Bs0 decays is studied for the first time. The data are recorded by the LHCb experiment in pp collisions corresponding to an integrated luminosity of 3 fb-1 at center-of-mass energies of 7 and 8 TeV. A time-dependent analysis of the Bs0âÏγ decay rate is conducted to determine the parameter AÎ, which is related to the ratio of right- over left-handed photon polarization amplitudes in bâsγ transitions. A value of AÎ=-0.98-0.52+0.46-0.20+0.23 is measured. This result is consistent with the standard model prediction within 2 standard deviations.File in questo prodotto:
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