CMS Collaboration2017-10-252017-10-252016-06-10Khachatryan, Vardan, et al. "Measurement of the CP-violating weak phase ϕ s and the decay width difference ΔΓ s using the Bs0→ J/ψϕ (1020) decay channel in pp collisions at s= 8 TeV." Physics letters B (2017).https://hdl.handle.net/1808/25191The CP-violating weak phase of the meson and the decay width difference of the light and heavy mass eigenstates are measured with the CMS detector at the LHC using a data sample of decays. The analysed data set corresponds to an integrated luminosity of collected in pp collisions at a centre-of-mass energy of . A total of 49 200 reconstructed decays are used to extract the values of and by performing a time-dependent and flavour-tagged angular analysis of the final state. The weak phase is measured to be , and the decay width difference is .© 2016 CERN for the benefit of the CMS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license.http://creativecommons.org/licenses/by/4.0/CMSPhysicsB-physicsCP violationArticle10.1016/j.physletb.2016.03.046openAccess