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Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at √s = 8 TeV

Khachatryan, V. and Apresyan, A. and Bornheim, A. and Bunn, J. and Chen, Y. and Duarte, J. and Mott, A. and Newman, H. B. and Pena, C. and Pierini, M. and Spiropulu, M. and Vlimant, J. R. and Wilkinson, R. and Xie, S. and Zhu, R. Y. and Dubinin, M. (2015) Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at √s = 8 TeV. Physical Review D, 91 (5). Art. No. 052012. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:20150501-142234525

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Abstract

A search is performed for long-lived particles that decay into final states that include a pair of electrons or a pair of muons. The experimental signature is a distinctive topology consisting of a pair of charged leptons originating from a displaced secondary vertex. Events corresponding to an integrated luminosity of 19.6 (20.5)  fb^(−1) in the electron (muon) channel were collected with the CMS detector at the CERN LHC in proton-proton collisions at √s=8  TeV. No significant excess is observed above standard model expectations. Upper limits on the product of the cross section and branching fraction of such a signal are presented as a function of the long-lived particle’s mean proper decay length. The limits are presented in an approximately model-independent way, allowing them to be applied to a wide class of models yielding the above topology. Over much of the investigated parameter space, the limits obtained are the most stringent to date. In the specific case of a model in which a Higgs boson in the mass range 125–1000  GeV/c^2 decays into a pair of long-lived neutral bosons in the mass range 20–350  GeV/c^2, each of which can then decay to dileptons, the upper limits obtained are typically in the range 0.2–10 fb for mean proper decay lengths of the long-lived particles in the range 0.01–100 cm. In the case of the lowest Higgs mass considered (125  GeV/c^2), the limits are in the range 2–50 fb. These limits are sensitive to Higgs boson branching fractions as low as 10^(−4).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.91.052012DOIArticle
http://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.052012PublisherArticle
http://arxiv.org/abs/1411.6977arXivDiscussion Paper
Additional Information:© 2015 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Received 25 November 2014; published 18 March 2015. 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); TUBITAK 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 Foundation for Polish Science, cofinanced by the European Union, Regional Development Fund; the Compagnia di San Paolo (Torino); the Consorzio per la Fisica (Trieste); MIUR Grant No. 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.
Group:CMS@Caltech
Funders:
Funding AgencyGrant Number
BMWFW and FWF (Austria)UNSPECIFIED
FNRS and FWO (Belgium) UNSPECIFIED
CNPq, CAPES, FAPERJ, and FAPESP (Brazil)UNSPECIFIED
COLCIENCIAS (Colombia)UNSPECIFIED
MSES and CSF (Croatia)UNSPECIFIED
RPF (Cyprus)UNSPECIFIED
MoER, ERC IUT and ERDF (Estonia)UNSPECIFIED
Academy of Finland, MEC, and HIP (Finland)UNSPECIFIED
CEA and CNRS/IN2P3 (France)UNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)UNSPECIFIED
GSRT (Greece)UNSPECIFIED
OTKA and NIH (Hungary)UNSPECIFIED
DAE and DST (India)UNSPECIFIED
IPM (Iran)UNSPECIFIED
Science Foundation, IrelandUNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
MSIP and NRF (Korea)UNSPECIFIED
LAS (Lithuania)UNSPECIFIED
MOE and UM (Malaysia)UNSPECIFIED
CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico)UNSPECIFIED
MBIE (New Zealand)UNSPECIFIED
PAEC (Pakistan)UNSPECIFIED
MSHE and NSC (Poland)UNSPECIFIED
Fundação para a Ciência e a Tecnologia (FCT)UNSPECIFIED
JINR (Dubna)UNSPECIFIED
MON, RosAtom, RAS, and RFBR (Russia)UNSPECIFIED
MESTD (Serbia)UNSPECIFIED
SEIDI and CPAN (Spain)UNSPECIFIED
Swiss Funding Agencies (Switzerland)UNSPECIFIED
MST (Tapei)UNSPECIFIED
ThEPCenter, IPST, STAR and NSTDA (Thailand)UNSPECIFIED
TUBITAK and TAEK (Turkey) UNSPECIFIED
NASU and SFFR (Ukraine)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Marie-Curie programme and the European Research Council and EPLANET (European Union)UNSPECIFIED
Leventis Foundation UNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Belgian Federal Science Policy OfficeUNSPECIFIED
Fonds pour la Formation à la Recherche dans l’índustrie et dans l’Ágriculture (FRIA-Belgium)UNSPECIFIED
Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)UNSPECIFIED
Ministry of Education, Youth and Sports (MEYS) of the Czech RepublicUNSPECIFIED
Council of Science and Industrial Research, IndiaUNSPECIFIED
HOMING PLUS program of Foundation for Polish Science, cofinanced from European Union UNSPECIFIED
Regional Development FundUNSPECIFIED
Compagnia di San Paolo (Torino)UNSPECIFIED
Consorzio per la Fisica (Trieste)UNSPECIFIED
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)20108T4XTM
Thalis and Aristeia programmes cofinanced by EU-ESFUNSPECIFIED
Greek NSRFUNSPECIFIED
Qatar National Research Fund National Priorities Research ProgramUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Helmholtz-Gemeinschaft Deutscher Forschungszentren (Germany)UNSPECIFIED
Classification Code:PACS: 14.80.Ec, 12.60.-i, 13.85.Rm
Record Number:CaltechAUTHORS:20150501-142234525
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150501-142234525
Official Citation:Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at √s=8  TeV V. Khachatryan et al. (CMS Collaboration) Phys. Rev. D 91, 052012 (2015) – Published 18 March 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57164
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:01 May 2015 22:46
Last Modified:01 May 2015 22:46

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