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Published June 10, 2016 | Published + Submitted
Journal Article Open

Measurement of the CP-violating weak phase φ_s and the decay width difference ΔΓ_s using the B^0_s → J/ψφ(1020)decay channel in pp collisions at √s = 8 TeV


The CP-violating weak phase ϕ_s of the B^0_s meson and the decay width difference ΔΓ_s of the B^0_s light and heavy mass eigenstates are measured with the CMS detector at the LHC using a data sample of B^0_s → J/ψφ(1020) → µ^+µ^-K^+K^- decays. The 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. A total of 49 200 reconstructed B^0_s decays are used to extract the values of ϕ_s and ΔΓ_s by performing a time-dependent and flavour-tagged angular analysis of the μ^+μ^−K^+K^− final state. The weak phase is measured to be ϕ_s =-0.075 ± 0.097(stat) ± 0.031(syst) rad, and the decay width difference is ΔΓ_s = 0.095 ± 0.013(stat) ± 0.007(syst) ps^(-1).

Additional Information

© 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/). Funded by SCOAP3. Received 27 July 2015, Revised 11 March 2016, Accepted 16 March 2016, Available online 23 March 2016. We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centres and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: BMWFW and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MOST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RPF (Cyprus); MoER, ERCIUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); LAS (Lithuania); MOE and UM (Malaysia); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS and RFBR (Russia); MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union); the Leventis Foundation; the Alfred P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS programme of the Foundation for Polish Science, cofinanced from European Union, Regional Development Fund; the Compagnia di San Paolo (Torino); the Consorzio per la Fisica (Trieste); MIUR project 20108T4XTM (Italy); the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF; the National Priorities Research Program by Qatar National Research Fund; the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand); and the Welch Foundation.

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Published - 1-s2.0-S037026931630017X-main.pdf

Submitted - 1507.07527v2.pdf


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