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Title: Angular analysis of the B 0 → K *0 e + e - decay in the low- q 2 region
Author: 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, V.
Ruiz, Hugo
LHCb Collaboration
Keywords: Hadrons
Gran Col·lisionador d'Hadrons
Física de partícules
Large Hadron Collider (France and Switzerland)
Particle physics
Issue Date: 14-Apr-2015
Publisher: Springer Verlag
Abstract: 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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It is part of: Journal of High Energy Physics, 2015, vol. 2015, num. 64, p. 1-26
Related resource:
ISSN: 1126-6708
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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