Precision measurement of $CP$ violation in $B_s^0 \to J/ψ K^+K^-$ decaysстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 22 октября 2015 г.
Аннотация:The time-dependent CP asymmetry in B0s→J/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 centre-of-mass energies of 7 and 8 TeV . In a sample of 96 000 B0s→J/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 B0s -- B¯¯¯0s system. The values obtained are ϕs=−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 B0s→J/ψπ+π− decays gives ϕs=−0.010±0.039 rad . 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.