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Preprint
Report number arXiv:2411.10219 ; LHCb-PAPER-2024-030 ; CERN-EP-2024-276 ; LHCB-PAPER-2024-030
Title Constraints on the photon polarisation in bsγ transitions using B0sϕe+e decays
Author(s) LHCb Collaboration  Zeige alle 1144 Autoren
Corporate author(s) LHCb Collaboration
Publication 2024
Imprint 15 Nov 2024
Number of pages 21
Note 21 pages, 4 figures. All figures and tables, along with any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/3433/ (LHCb public pages)
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; LHCb
Keywords flavor physics ; B physics ; rare decay
Abstract An angular analysis of the B0sϕe+e decay is performed using the proton-proton collision dataset collected between 2011 and 2018 by the LHCb experiment, corresponding to an integrated luminosity of 9fb1 at centre-of-mass energies of 7, 8 and 13TeV. The analysis is performed in the very low dielectron invariant mass-squared region between 0.0009 and 0.2615GeV2/c4. The longitudinal polarisation fraction of the ϕ meson is measured to be less than 11.5% at 90% confidence level. The AReCPT observable, which is related to the lepton forward-backward asymmetry, is measured to be 0.116±0.155±0.006, where the first uncertainty is statistical and the second systematic. The transverse asymmetries, A(2)T and AImCPT , which are sensitive to the virtual photon polarisation, are found to be 0.045±0.235±0.014 and 0.002±0.247±0.016, respectively. The results are consistent with Standard Model predictions.
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Copyright/License Preprint: © 2024 CERN (License: CC-BY-4.0)
Submitted by lhcb.secretariat@cern.ch



 


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