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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185717
Angular analysis of the B 0 → K *0 e + e - decay in the low- q 2 region
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An angular analysis of the B0 → K∗0 e +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 (q 2 ) interval between 0.002 and 1.120 GeV2/c4 . The angular observables FL and ARe T 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 ARe T = 0.10±0.18±0.05, where the first uncertainty is statistical and the second systematic. The angular observables A (2) T and AIm T which are sensitive to the photon polarisation in this q 2 range, are found to be A (2) T = −0.23 ± 0.23 ± 0.05 and AIm T = 0.14 ± 0.22 ± 0.05. The results are consistent with Standard Model predictions.
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BADALOV, A., CASANOVA MOHR, Raimon, GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, MARIN BENITO, Carla, PICATOSTE OLLOQUI, Eduardo, RIVES MOLINA, Vicente josé, RUIZ, Hugo (ruiz pérez), LHCb Collaboration. Angular analysis of the B 0 → K *0 e + e - decay in the low- q 2 region. _Journal of High Energy Physics_. 2015. Vol. 2015, núm. 64, pàgs. 1-26. [consulta: 23 de gener de 2026]. ISSN: 1126-6708. [Disponible a: https://hdl.handle.net/2445/185717]