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Article
Report number arXiv:1411.3104 ; LHCB-PAPER-2014-059 ; CERN-PH-EP-2014-271 ; LHCB-PAPER-2014-059 ; CERN-PH-EP-2014-271
Title Precision measurement of CP violation in B0sJ/ψK+K decays
Author(s) LHCb Collaboration  Prikaži svih 700 autora
Publication 2015-01-30
Imprint 12 Nov 2014
Number of pages 9
Note Comments: 6 figures
6 figures
In: Phys. Rev. Lett. 114 (2015) 041801
DOI 10.1103/PhysRevLett.114.041801
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; LHCb
Free keywords flavor physics ; B physics ; CP violation
Abstract The time-dependent CP asymmetry in B0sJ/ψK+K decays is measured using pp collision data, corresponding to an integrated luminosity of 3.0fb1, collected with the LHCb detector at centre-of-mass energies of 7 and 8TeV. In a sample of 96 000 B0sJ/ψK+K decays, the CP-violating phase ϕs is measured, as well as the decay widths ΓL and ΓH of the light and heavy mass eigenstates of the B0sˉB0s system. The values obtained are ϕs=0.058±0.049±0.006 rad, Γs(ΓL+ΓH)/2=0.6603±0.0027±0.0015ps1, andΔΓsΓLΓH=0.0805±0.0091±0.0032ps1, where the first uncertainty is statistical and the second systematic. These are the most precise single measurements of those quantities to date. A combined analysis with B0sJ/ψπ+π decays gives ϕs=0.010±0.039rad. All measurements are in agreement with the Standard Model predictions. For the first time the phase ϕs is measured independently for each polarisation state of the K+K system and shows no evidence for polarisation dependence.
Copyright/License publication: © 2015-2025 CERN (License: CC-BY-3.0)
preprint: © 2014-2025 CERN (License: CC-BY-4.0)



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