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Title: Measurement of the CP-violating weak phase $$\mathrm{ \phi_s }$$ and the decay width difference $$ \Delta \Gamma_{ \mathrm{s} }$$ using the $$ \mathrm{B^0_s} \to \mathrm{J} / \psi \phi(1020) $$ decay channel in pp collisions at $$\sqrt{s} =$$ 8 TeV

The CP-violating weak phase φs of the B0 s meson and the decay width difference ΔΓs of the B0 s light and heavy mass eigenstates are measured with the CMS detector at the LHC using a data sample of B0 s →J/ψ φ(1020) → µ +µ -K+K- decays. Our analysed data set corresponds to an integrated luminosity of 19.7 fb-1 collected in pp collisions at a centre-of-mass energy of 8 TeV. Additionally, a total of 49 200 reconstructed B0 s decays are used to extract the values of φs and ΔΓs by performing a time-dependent and flavourtagged angular analysis of the µ +µ -K+K- final state. The weak phase is measured to be φs = -0.075 ± 0.097 (stat) ± 0.031 (syst) rad, and the decay width difference is ΔΓs = 0.095 ± 0.013 (stat) ± 0.007 (syst) ps-1 .
Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.
Publication Date:
OSTI Identifier:
1243354
Report Number(s):
FERMILAB-PUB-15-325-CMS
Journal ID: ISSN 0370-2693; arXiv eprint number arXiv:1507.07527
Grant/Contract Number:
AC02-07CH11359
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 757; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
CMS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS