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High Energy Physics - Experiment

arXiv:1507.07527 (hep-ex)
[Submitted on 27 Jul 2015 (v1), last revised 19 Apr 2016 (this version, v2)]

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

Authors:CMS Collaboration
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Abstract:The CP-violating weak phase phi[s] of the Bs meson and the decay width difference Delta Gamma[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 49,200 reconstructed Bs decays are used to extract the values of phi[s] and Delta Gamma[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 (syst) rad, and the decay width difference is Delta Gamma[s] = 0.095 +/- 0.013 (stat) +/- 0.007 (syst) inverse picoseconds.
Comments: Replaced with published version. Added journal reference. All figures and tables can be found at this http URL
Subjects: High Energy Physics - Experiment (hep-ex)
Report number: CMS-BPH-13-012, CERN-PH-EP-2015-192
Cite as: arXiv:1507.07527 [hep-ex]
  (or arXiv:1507.07527v2 [hep-ex] for this version)
  https://doi.org/10.48550/arXiv.1507.07527
Journal reference: Phys. Lett. B 757 (2016) 97
Related DOI: https://doi.org/10.1016/j.physletb.2016.03.046

Submission history

From: The CMS Collaboration [view email]
[v1] Mon, 27 Jul 2015 19:00:41 UTC (383 KB)
[v2] Tue, 19 Apr 2016 15:31:54 UTC (380 KB)
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