Measurement of the CP-violating phase ϕsand the Bs0meson decay width difference with Bs 0→ J/ψϕ decays in ATLAS

The ATLAS Collaboration

Research output: Contribution to journalArticle

19 Citations (Scopus)


A measurement of the Bs0decay parameters in the Bs0→ J/ψϕ channel using an integrated luminosity of 14.3 fb−1collected by the ATLAS detector from 8 TeV pp collisions at the LHC is presented. The measured parameters include the CP -violating phase ϕs, the decay width Γs and the width difference between the mass eigenstates ΔΓs. The values measured for the physical parameters are statistically combined with those from 4.9 fb−1of 7 TeV data, leading to the following: Φs = -0.090 ± 0.078 (stat.) ± (syst.) rad Δ Γs = 0.085 ± 0.011 (stat.) ± 0.007 (syst.) Ps-1 Δ Γs = 0.675 ± 0.003 (stat.) ± 0.03 (syst.) Ps-1 In the analysis the parameter ΔΓs is constrained to be positive. Results for ϕs and ΔΓs are also presented as 68% and 95% likelihood contours in the ϕs-ΔΓs plane. Also measured in this decay channel are the transversity amplitudes and corresponding strong phases. All measurements are in agreement with the Standard Model predictions.[Figure not available: see fulltext.]

Original languageEnglish
Article number147
JournalJournal of High Energy Physics
Issue number8
Publication statusPublished - 2016 Aug 1


  • B physics
  • CP violation
  • Flavor physics
  • Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Fingerprint Dive into the research topics of 'Measurement of the CP-violating phase ϕ<sub>s</sub>and the B<sub>s</sub><sup>0</sup>meson decay width difference with B<sub>s</sub> <sup>0</sup>→ J/ψϕ decays in ATLAS'. Together they form a unique fingerprint.

  • Cite this