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Strong constraints on the b → sγ photon polarisation from B 0 → K 0 e + e − decays

LHCb Collaboration ; Alfonso Albero, Alejandro ; Garrido Beltrán, Lluís ; Gascón Fora, David ; Graciani Díaz, Ricardo ; Graugés Pous, Eugeni ; Marin Benito, Carla

Springer Verlag 2020

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  • Título:
    Strong constraints on the b → sγ photon polarisation from B 0 → K 0 e + e − decays
  • Autor: LHCb Collaboration ; Alfonso Albero, Alejandro ; Garrido Beltrán, Lluís ; Gascón Fora, David ; Graciani Díaz, Ricardo ; Graugés Pous, Eugeni ; Marin Benito, Carla
  • Assuntos: Experiments ; Física de partícules ; Gran Col·lisionador d'Hadrons ; Hadrons ; Large Hadron Collider (France and Switzerland) ; Particle physics
  • Notas: Journal of High Energy Physics, 2020, vol. 8, num. 3, p. 1-25
    Articles publicats en revistes (Física Quàntica i Astrofísica)
    1126-6708
    https://doi.org/10.1007/JHEP12(2020)081
    710494
    Reproducció del document publicat a: https://doi.org/10.1007/JHEP12(2020)081
    http://hdl.handle.net/2445/185475
  • Descrição: An angular analysis of the B0 → K∗0 e +e − decay is performed using a data sample corresponding to an integrated luminosity of 9 fb−1 of pp collisions collected with the LHCb experiment. The analysis is conducted in the very low dielectron mass squared (q 2 ) interval between 0.0008 and 0.257 GeV2 , where the rate is dominated by the B0 → K∗0γ transition with a virtual photon. The fraction of longitudinal polarisation of the K∗0 meson, FL, is measured to be FL = (4.4 ± 2.6 ± 1.4)%, where the first uncertainty is statistical and the second systematic. The ARe T observable, which is related to the lepton forward-backward asymmetry, is measured to be ARe T = −0.06 ± 0.08 ± 0.02. The A (2) T and AIm T transverse asymmetries, which are sensitive to the virtual photon polarisation, are found to be A (2) T = 0.11 ± 0.10 ± 0.02 and AIm T = 0.02 ± 0.10 ± 0.01. The results are consistent with Standard Model predictions and provide the world's best constraint on the b → sγ photon polarisation.
  • Editor: Springer Verlag
  • Data de criação/publicação: 2020
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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