# Measurement of the CP-violating weak phase phi[s] and the decay width difference DeltaGamma[s] using the Bs to J/Psi phi(1020) decay channel in pp collisions at sqrt(s) = 8 TeV

Abstract : The CP-violating weak phase phi[s] of the Bs meson and the decay width difference DeltaGamma[s] of the Bs light and heavy mass eigenstates are measured with the CMS detector at the LHC using a data sample of Bs to J/Psi phi(1020) to mu+mu-K+K- decays. The analysed data set corresponds to an integrated luminosity of 19.7 inverse femtobarns collected in pp collisions at a centre-of-mass energy of 8 TeV. A total of 49200 reconstructed Bs decays are used to extract the values of phi[s] and DeltaGamma[s] by performing a time-dependent and flavour-tagged angular analysis of the mu+mu-K+K- final state. The weak phase is measured to be phi[s] = -0.075 +/- 0.097 (stat) +/- 0.031 (sys) rad, and the decay width difference is DeltaGamma[s] = 0.095 +/- 0.013 (stat) +/- 0.007 (sys) inverse picoseconds.
Type de document :
Article dans une revue
Physics Letters B, Elsevier, 2016, 757, pp.97-120. 〈10.1016/j.physletb.2016.03.046〉

http://hal.in2p3.fr/in2p3-01180716
Contributeur : Sylvie Flores <>
Soumis le : mardi 28 juillet 2015 - 07:19:47
Dernière modification le : jeudi 10 mai 2018 - 01:59:58

### Citation

V. Khachatryan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Measurement of the CP-violating weak phase phi[s] and the decay width difference DeltaGamma[s] using the Bs to J/Psi phi(1020) decay channel in pp collisions at sqrt(s) = 8 TeV. Physics Letters B, Elsevier, 2016, 757, pp.97-120. 〈10.1016/j.physletb.2016.03.046〉. 〈in2p3-01180716〉

### Métriques

Consultations de la notice