Measurement of the CP-violating weak phase φs and the decay width difference δΓc using the Bs0→J/ψφ(1020) decay channel in pp collisions at √ s=8 TeV

摘要

The CP-violating weak phase ϕs of the View the MathML source meson and the decay width difference ΔΓs of the View the MathML source light and heavy mass eigenstates are measured with the CMS detector at the LHC using a data sample of View the MathML source decays. The analysed data set corresponds to an integrated luminosity of View the MathML source collected in pp collisions at a centre-of-mass energy of View the MathML source. A total of 49 200 reconstructed View the MathML source decays are used to extract the values of ϕs and ΔΓs by performing a time-dependent and flavour-tagged angular analysis of the μ+μ−K+K− final state. The weak phase is measured to be View the MathML source, and the decay width difference is View the MathML source.