Search for a pseudoscalar boson decaying into a Z boson and the 125 GeV Higgs boson in ?+??bb? final states

Abstract

2-s2.0-85040831449 ; Results are reported on a search for decays of a pseudoscalar A boson into a Z boson and a light scalar h boson, where the Z boson decays into a pair of oppositely-charged electrons or muons, and the h boson decays into bb?. The search is based on data from proton–proton collisions at a center-of-mass energy s=8 TeV collected with the CMS detector, corresponding to an integrated luminosity of 19.7 fb?1. The h boson is assumed to be the standard model-like Higgs boson with a mass of 125 GeV. With no evidence for signal, upper limits are obtained on the product of the production cross section and the branching fraction of the A boson in the Zh channel. Results are also interpreted in the context of two Higgs doublet models. © 2015 CERN for the benefit of the CMS Collaboration ; National Science Foundation, NSF: 1120138, 1151640, 1206044, 1211067, 1306951, 1314131, 1506130, 1506168, 1508869 National Institutes of Health, NIH U.S. Department of Energy, USDOE Alfred P. Sloan Foundation Hispanics in Philanthropy, HIP Human Growth Foundation, HGF Alexander von Humboldt-Stiftung California Department of Fish and Wildlife, CDFW Ministry of Science and Technology, MOST University of Minnesota, UM Compagnia di San Paolo Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS) Children's Specialists Foundation, CSF California Earthquake Authority, CEA Qatar National Research Fund, QNRF Ministry of Education, MOE Center for African Studies, CAS Secretaría de Educación Pública, SEP Türkiye Atom Enerjisi Kurumu, TAEK Santa Fe Institute, SFI Louisiana Academy of Sciences, LAS Rochester Academy of Science, RAS National Research Foundation, NRF Missouri University of Science and Technology, MST Medical Engineering Centre, King's College London, MEC CERN Thailand Center of Excellence in Physics Cosmetic Surgery Foundation, CSF Institute for the Promotion of Teaching Science and Technology, IPST Science and Technology Facilities Council, STFC: ST/I005912/1, ST/I505580/1, ST/J004901/1, ST/J005665/1, ST/J50094X/1, ST/K001256/1, ST/K001604/1, ST/K001639/1, ST/K003542/1, ST/K003844/1, ST/L005603/1, ST/L00609X/1, ST/M004775/1, ST/M005356/1, ST/N000250/1 European Commission, EC European Research Council, ERC National Stroke Foundation, NSF Department of Science and Technology, Ministry of Science and Technology, India, ?????? Council of Scientific and Industrial Research, India, CSIR Ministry of Education - Singapore, MOE Department of Atomic Energy, Government of India, ???? Science Foundation Ireland, SFI Helmholtz-Gemeinschaft, HGF Deutsche Forschungsgemeinschaft, DFG Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, SNF: 153664 Fundação de Amparo à Pesquisa do Estado de São Paulo, FAPESP National Natural Science Foundation of China, NSFC Research Promotion Foundation, ???? Ministerstvo Školství, Mláde?e a T?lov?chovy, MŠMT National Science Council, NSC Fundacja na rzecz Nauki Polskiej, FNP Fundação para a Ciência e a Tecnologia, FCT Russian Foundation for Basic Research, ???? Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, CAPES Academy of Finland Bundesministerium für Bildung und Forschung, BMBF Chinese Academy of Sciences, CAS Austrian Science Fund, FWF Fonds De La Recherche Scientifique - FNRS, FNRS Russian Academy of Sciences, ??? Belgian Federal Science Policy Office, BELSPO Fonds Wetenschappelijk Onderzoek, FWO Agentschap voor Innovatie door Wetenschap en Technologie, IWT Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture, FRIA Consejo Nacional de Ciencia y Tecnología, CONACYT Ministerio de Economía y Competitividad, MINECO Ministero dell'Istruzione, dell'Università e della Ricerca, MIUR: 20108T4XTM Bundesministerium für Wissenschaft, Forschung und Wirtschaft, BMWFW General Secretariat for Research and Technology, GSRT Ministry of Business, Innovation and Employment, MBIE Hungarian Scientific Research Fund, OTKA Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq Ministry of Science, ICT and Future Planning, MSIP National Research Foundation of Korea, NRF Joint Institute for Nuclear Research, JINR Instituto Nazionale di Fisica Nucleare, INFN Ministry of Science ICT and Future Planning, MSIP A.G. Leventis Foundation National Science and Technology Development Agency, ???? Universiti Malaya, UM Türkiye Bilimsel ve Teknolojik Araştirma Kurumu, TÜBITAK Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, FAPERJ Ministry of Science and Technology, Taiwan, MOST National Academy of Sciences of Ukraine, NASU Centre National de la Recherche Scientifique, CNRS Ministry of Education and Science, MES Institute for Research in Fundamental Sciences, IPM Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Bundesministerium für Bildung und Frauen, BMBF Secretaría de Estado de Investigación, Desarrollo e Innovación, SEIDI European Regional Development Fund, FEDER State Atomic Energy Corporation ROSATOM, ROSATOM Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, CINVESTAV Pakistan Atomic Energy Commission, PAEC State Fund for Fundamental Research of Ukraine, SFFR Department of Science and Technology, Government of West Bengal, DST Fundació Catalana de Trasplantament, FCT Institut National de Physique Nucléaire et de Physique des Particules, IN2P3 ; 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 centers 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 , 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); TÜBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA). ; Individuals have received support from the Marie-Curie program 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 program 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 programs cofinanced by EU-ESF and the Greek NSRF ; and the National Priorities Research Program by Qatar National Research Fund . ; Individuals have received support from the Marie-Curie program 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 program 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 programs cofinanced by EU-ESF and the Greek NSRF; and the National Priorities Research Program by Qatar National Research Fund.