Measurement Of The Cp Violating Weak Phase Mathrm Phi S And The Decay Width Difference Delta Gamma Mathrm S Using The Mathrm B 0 S To Mathrm J

Measurement of the CP-violating Weak Phase $\mathrm{ \phi_s }$ and the Decay Width Difference $ \Delta \Gamma_{ \mathrm{s} }$ Using the $ \mathrm{B^0_s} \to \mathrm{J}

The CP-violating weak phase [phi]s of the B0 s meson and the decay width difference [Delta][Gamma]s of the B0 s light and heavy mass eigenstates are measured with the CMS detector at the LHC using a data sample of B0 s 2!/[psi] [phi](1020) 2!æ +æ -K+K- decays. Our analysed data set corresponds to an integrated luminosity of 19.7 fb-1 collected in pp collisions at a centre-of-mass energy of 8 TeV. Additionally, a total of 49 200 reconstructed B0 s decays are used to extract the values of [phi]s and [Delta][Gamma]s by performing a time-dependent and flavourtagged angular analysis of the æ +æ -K+K- final state. The weak phase is measured to be [phi]s = -0.075 " 0.097 (stat) " 0.031 (syst) rad, and the decay width difference is [Delta][Gamma]s = 0.095 " 0.013 (stat) " 0.007 (syst) ps-1.

Measurement of the CP-violating Weak Phase $\mathrm{ \phi_s }$ and the Decay Width Difference $ \Delta \Gamma_{ \mathrm{s} }$ Using the $ \mathrm{B0̂_s} \to \mathrm{J}

The CP-violating weak phase ?s of the B0 s meson and the decay width difference ??s of the B0 s light and heavy mass eigenstates are measured with the CMS detector at the LHC using a data sample of B0 s →J/? ?(1020) → æ +æ -K+K- decays. Our analysed data set corresponds to an integrated luminosity of 19.7 fb-1 collected in pp collisions at a centre-of-mass energy of 8 TeV. Additionally, a total of 49 200 reconstructed B0 s decays are used to extract the values of ?s and ??s by performing a time-dependent and flavourtagged angular analysis of the æ +æ -K+K- final state. The weak phase is measured to be ?s = -0.075 ± 0.097 (stat) ± 0.031 (syst) rad, and the decay width difference is ??s = 0.095 ± 0.013 (stat) ± 0.007 (syst) ps-1 .

Measurement of the CP Violating Phase Φs [phi S] and the Decay Width Difference ΔΓs [delta-gamma S] in the Decay BOs → J/ΨΦ [J, Psi-phi] with the ATLAS Experiment