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Report number arXiv:2308.01468 ; LHCb-PAPER-2023-016 ; CERN-EP-2023-145 ; CERN-EP-2023-145 CERN-EP-2023-145; LHCb-PAPER-2023-016
Title Improved measurement of CP violation parameters in B0sJ/ψK+K decays in the vicinity of the ϕ(1020) resonance
Author(s) LHCb Collaboration  Show all 1103 authors
Corporate Author(s) LHCb Collaboration
Publication 2024-02-02
Imprint 04 Aug 2023
Number of pages 12
Note All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-016.html (LHCb public pages)
In: Phys. Rev. Lett. 132 (2024) 051802
DOI 10.1103/PhysRevLett.132.051802
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; LHCb
Free keywords flavor physics ; B physics ; CP violation ; CKM angle beta ; oscillation
Abstract The decay-time-dependent CP asymmetry in B0sJ/ψ(μ+μ)K+K decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 6fb1, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000 B0s signal decays with an invariant K+K mass in the vicinity of the ϕ(1020) resonance, the CP-violating phase ϕs is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the B0s-¯B0s system, ΔΓs, and the difference of the average B0s and B0 meson decay widths, ΓsΓd. The values obtained are ϕs=0.039±0.022±0.006 rad, ΔΓs=0.0845±0.0044±0.0024ps1 and ΓsΓd=0.0056+0.00130.0015±0.0014ps1, where the first uncertainty is statistical and the second systematic. These are the most precise single measurements to date and are consistent with expectations based on the Standard Model and with the previous LHCb analyses of this decay. These results are combined with previous independent LHCb measurements. The phase ϕs is also measured independently for each polarization state of the K+K system and shows no evidence for polarization dependence.
Copyright/License Preprint: © 2023-2024 CERN (License: CC-BY-4.0)
Publication: © 2024 CERN (License: CC BY 4.0), sponsored by SCOAP³



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 Record created 2023-08-04, last modified 2024-10-18


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