An angular analysis of the B0 → K*0e+e− decay is performed using a data sample, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared (q2) interval between 0.002 and 1.120 GeV2/c4. The angular observables FL and A T Re which are related to the K*0 polarisation and to the lepton forward-backward asymmetry, are measured to be FL = 0.16 ± 0.06 ± 0.03 and A T Re  = 0.10 ± 0.18 ± 0.05, where the first uncertainty is statistical and the second systematic. The angular observables A T (2) and A T Im which are sensitive to the photon polarisation in this q2 range, are found to be A T (2)  = − 0.23 ± 0.23 ± 0.05 and A T Im  = 0.14 ± 0.22 ± 0.05. The results are consistent with Standard Model predictions.

Angular analysis of the B0→ K*0e+e−decay in the low-q2region / Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., CAlvarez artelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Anderson, J., Andreassen, R., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2015:4(2015). [10.1007/JHEP04(2015)064]

Angular analysis of the B0→ K*0e+e−decay in the low-q2region

Capriotti, L.;Casse, G.;Di Domenico, A.;Sarti, A.;Sciubba, A.;
2015

Abstract

An angular analysis of the B0 → K*0e+e− decay is performed using a data sample, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared (q2) interval between 0.002 and 1.120 GeV2/c4. The angular observables FL and A T Re which are related to the K*0 polarisation and to the lepton forward-backward asymmetry, are measured to be FL = 0.16 ± 0.06 ± 0.03 and A T Re  = 0.10 ± 0.18 ± 0.05, where the first uncertainty is statistical and the second systematic. The angular observables A T (2) and A T Im which are sensitive to the photon polarisation in this q2 range, are found to be A T (2)  = − 0.23 ± 0.23 ± 0.05 and A T Im  = 0.14 ± 0.22 ± 0.05. The results are consistent with Standard Model predictions.
2015
Rare decay Polarization B physics Flavour Changing Neutral Currents Hadron-Hadron Scattering
01 Pubblicazione su rivista::01a Articolo in rivista
Angular analysis of the B0→ K*0e+e−decay in the low-q2region / Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., CAlvarez artelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Anderson, J., Andreassen, R., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2015:4(2015). [10.1007/JHEP04(2015)064]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1074829
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