Measurement of the ratio B(Bs0 ? J/?f0(980))/B(Bs0 ? J/??(1020)) in pp collisions at ?s=7 TeV

Open Access

Abstract

A measurement of the ratio of the branching fractions of the Bs0 meson to J/?f0(980) and to J/??(1020) is presented. The J/?, f0(980), and ?(1020) are observed through their decays to ?+?-, ?+?-, and K+K-, respectively. The f0 and the ? are identified by requiring |M?+?--974 MeV|>50 MeV and |MK+K--1020 MeV|>10 MeV. The analysis is based on a data sample of pp collisions at a centre-of-mass energy of 7 TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3 fb-1. The measured ratio is B(Bs0?J/?f0)B(f0??+?-)/B(Bs0?J/??)B(??K+K-) = 0.140±0.008(stat) ± 0.023(syst), where the first uncertainty is statistical and the second is systematic ; Science and Technology Facilities Council: CMS Science and Technology Facilities Council: GRIDPP Science and Technology Facilities Council: PP/E000479/1 Science and Technology Facilities Council: PP/E002803/1 Science and Technology Facilities Council: ST/H000925/1 Science and Technology Facilities Council: ST/H000925/2 Science and Technology Facilities Council: ST/I000305/1 Science and Technology Facilities Council: ST/I003622/1 Science and Technology Facilities Council: ST/J004871/1 Science and Technology Facilities Council: ST/J005479/1 Science and Technology Facilities Council: ST/K001256/1 Science and Technology Facilities Council: ST/K001531/1 Science and Technology Facilities Council: ST/K001639/1 Science and Technology Facilities Council: ST/K003542/1 Science and Technology Facilities Council: ST/L005603/1 Science and Technology Facilities Council: ST/M002020/1 Science and Technology Facilities Council: ST/M004775/1 Science and Technology Facilities Council: ST/N000242/1 Science and Technology Facilities Council: ST/N000250/1 Science and Technology Facilities Council: ST/N001273/1 ; 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); Fonds De La Recherche Scientifique – 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, ERC IUT 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 A.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 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; and the National Priorities Research Program by Qatar National Research Fund.