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PoS(CKM2016)082

Latest Results on the CP-violating weak phase $\phi_{\textrm{s}}$ and the decay width difference $\Delta \Gamma_{\textrm{s}}$ From the CMS Experiment

P. Behera, on behalf of the CMS collaboration

in 9th International Workshop on the CKM Unitarity Triangle

Contribution: pdf

Abstract

The decay $\textrm{B}_{\textrm{s}}^{0} \to \textrm{J}/\psi \phi(1020) \to \mu^{+}\mu^{-}K^{+}K^{-}$ is used to measure the CP-violating weak phase $\phi_{\textrm{s}}$ and the decay width difference $\Delta \Gamma_{\textrm{s}}$ of the B$_{\textrm{s}}^{0}$\ light and heavy mass eigenstates are measured with the CMS detector at the LHC. The analysis is performed using an integrated luminosity of 19.7 fb$^{-}$ collected in pp collisions at a centre-of-mass energy of 8 TeV corresponds to a total of 49, 200 reconstructed B$_{s}^{0}$ decays. A time-dependent and flavour-tagged angular analysis is performed. The weak phase is measured to be $\phi_{\textrm{s}} = - 0.075 \pm 0.097 (\textrm{stat.}) \pm 0.031 (\textrm{syst.})$ rad, and the decay width difference is $\Delta \Gamma_{s} = 0.095 \pm 0.013 (\textrm{stat.}) \pm 0.007 (\textrm{syst.}) \textrm{ps}^{-1}$