Measurement of the time-dependent CP asymmetries in $B_s^0\rightarrow J/ψ K_\rm S^0$статья
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Аннотация:The first measurement of decay-time-dependent CP {} asymmetries in the decay B0s→J/ψK0S and an updated measurement of the ratio of branching fractions B(B0s→J/ψK0S)/B(B0→J/ψK0S) are presented. The results are obtained using data corresponding to an integrated luminosity of 3.0\: fb−1 of proton--proton collisions recorded with the LHCb detector at centre-of-mass energies of 7 and 8 TeV . The results on the CP asymmetries are
\ADG(B0s→J/ψK0S)Cdir(B0s→J/ψK0S)Smix(B0s→J/ψK0S)=0.49±0.770.65(stat)±0.06(syst),=−0.28±0.41(stat)±0.08(syst),=−0.08±0.40(stat)±0.08(syst).
The ratio B(B0s→J/ψK0S)/B(B0→J/ψK0S) is measured to be
0.0431±0.0017(stat)±0.0012(syst)±0.0025(fs/fd),
where the last uncertainty is due to the knowledge of the B0s and B0 production fractions.