Studies of angular correlations in the decays B0s→J/ψφ by using the SIMUB generator Original Research Article

The performance of the method of angular moments on the ΔΓs determination from analysis of untagged decays B0s(t),B 0s(t)→J/ψ(→l+l−)φ(→K+K−) is examined by using the SIMUB generator. The results of Monte Carlo studies with evaluation of measurement errors are presented. The method of angular moments gives stable results for the estimate of ΔΓs and is found to be an efficient and flexible tool for the quantitative investigation of the B0s→J/ψφ decay. The statistical error of the ratio ΔΓs/Γs for values of this ratio in the interval [0.03,0.3] was found to be independent on this value, being 0.015 for 105 events.