Precision measurement of CP violation in B(S)(0)âJ/ΨK+K- decays.
Phys Rev Lett
; 114(4): 041801, 2015 Jan 30.
Article
en En
| MEDLINE
| ID: mdl-25679885
ABSTRACT
The time-dependent CP asymmetry in B(s)(0)âJ/ψK+K- decays is measured using pp collision data, corresponding to an integrated luminosity of 3.0 fb-1, collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV. In a sample of 96,000 B(s)(0)âJ/ψK+K- decays, the CP-violating phase Ïs is measured, as well as the decay widths ΓL and ΓH of the light and heavy mass eigenstates of the B(s)(0)-B[over ¯]s0 system. The values obtained are Ïs=-0.058±0.049±0.006 rad, Γs≡(ΓL+ΓH)/2=0.6603±0.0027±0.0015 ps-1, and ΔΓs≡ΓL-ΓH=0.0805±0.0091±0.0032 ps-1, 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 Bs0âJ/ψπ+π- decays gives Ïs=-0.010±0.039 rad. All measurements are in agreement with the standard model predictions. For the first time, the phase Ïs is measured independently for each polarization state of the K+K- system and shows no evidence for polarization dependence.
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Colección:
01-internacional
Base de datos:
MEDLINE
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Phys Rev Lett
Año:
2015
Tipo del documento:
Article
País de afiliación:
Países Bajos