The polarization of photons produced in radiative B0s 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 B0s → φγ decay rate is conducted to determine the parameter AΔ, which is related to the ratio of right- over left-handed photon polarization amplitudes in b → sγ transitions. A value of AΔ 1⁄4 −0.98þ0.46þ0.23 is measured. This result is consistent −0.52 −0.20 with the standard model prediction within 2 standard deviations.

First Experimental Study of Photon Polarization in Radiative Bs0 Decays / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 1092-0145. - 118:2(2017). [10.1103/PhysRevLett.118.021801]

First Experimental Study of Photon Polarization in Radiative Bs0 Decays

Capriotti, L.;Casse, G.;Sarti, A.;Sciubba, A.;
2017

Abstract

The polarization of photons produced in radiative B0s 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 B0s → φγ decay rate is conducted to determine the parameter AΔ, which is related to the ratio of right- over left-handed photon polarization amplitudes in b → sγ transitions. A value of AΔ 1⁄4 −0.98þ0.46þ0.23 is measured. This result is consistent −0.52 −0.20 with the standard model prediction within 2 standard deviations.
2017
B physics, photon polarization.
01 Pubblicazione su rivista::01a Articolo in rivista
First Experimental Study of Photon Polarization in Radiative Bs0 Decays / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 1092-0145. - 118:2(2017). [10.1103/PhysRevLett.118.021801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1074514
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