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Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at √s=8TeV

Chatrchyan, S. and Apresyan, A. and Bornheim, A. and Bunn, J. and Chen, Y. and Di Marco, E. and Duarte, J. and Mott, A. and Newman, H. B. and Pena, C. and Rogan, C. and Spiropulu, M. and Timciuc, V. and Wilkinson, R. and Xie, S. and Zhu, R. Y. and Dias, F. A. and Dubinin, M. (2014) Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at √s=8TeV. Physics Letters B, 736 . pp. 371-397. ISSN 0370-2693. http://resolver.caltech.edu/CaltechAUTHORS:20141017-090018333

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Abstract

A search for supersymmetry through the direct pair production of top squarks, with Higgs (H) or Z bosons in the decay chain, is performed using a data sample of proton–proton collisions at √s=8TeV collected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5fb^(−1). The search is performed using a selection of events containing leptons and bottom-quark jets. No evidence for a significant excess of events over the standard model background prediction is observed. The results are interpreted in the context of simplified supersymmetric models with pair production of a heavier top-squark mass eigenstate t_2 decaying to a lighter top-squark mass eigenstate t_1 via either t_2→Ht_1 or t_2→Zt_1, followed in both cases by t_1→tχ^0_1, where ˜ χ^0_1 is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the t_1 and χ^0_1 states is approximately equal to the top-quark mass (m_(t1)−m_χ^0_1mt), which is not probed by searches for direct t_1 squark pair production. The analysis excludes top squarks with masses m_(t2)<575GeVand m_(t1)<400GeVat a 95% confidence level.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1405.3886arXivArticle
http://www.sciencedirect.com/science/article/pii/S0370269314005553PublisherArticle
http://dx.doi.org/10.1016/j.physletb.2014.07.053DOIArticle
Additional Information:© 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/). Funded by SCOAP3. Received 15 May 2014. Received in revised form 10 July 2014. Accepted 28 July 2014. Available online 1 August 2014. Editor: M. Doser. We congratulate our colleagues in the CERN accelerator depart-ments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS in-stitutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centersand 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 construc-tion 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); NRF and WCU (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 pro-gramme and the European Research Council and EPLANET (Euro-pean Union); the Leventis Foundation; the Alfred P. Sloan Founda-tion; the Alexander von Humboldt Foundation; the Belgian Fed-eral 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 Compagnia di San Paolo (Torino); the HOMING PLUS programme of Foundation For Polish Science, cofinanced by EU, Re-gional Development Fund; and the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF.
Group:CMS@Caltech
Funders:
Funding AgencyGrant Number
SCOAP3UNSPECIFIED
BMWFW and FWF (Austria)UNSPECIFIED
FNRS and FWO (Belgium) UNSPECIFIED
CNPq, CAPES, FAPERJ, and FAPESP (Brazil)UNSPECIFIED
MES (Bulgaria)UNSPECIFIED
CERNUNSPECIFIED
CAS, MoST, and NSFC (China)UNSPECIFIED
COLCIENCIAS (Colombia)UNSPECIFIED
MSES and CSF (Croatia)UNSPECIFIED
RPF (Cyprus) UNSPECIFIED
MoER, ERC IUT, and ERDF (Estonia)UNSPECIFIED
Academy of FinlandUNSPECIFIED
MEC and HIP (Finland)UNSPECIFIED
CEA and CNRS/IN2P3 (France)UNSPECIFIED
BMBF and HGF (Germany)UNSPECIFIED
GSRT (Greece)UNSPECIFIED
OTKA and NKTH (Hungary) UNSPECIFIED
DAE and DST (India) UNSPECIFIED
IPM (Iran)UNSPECIFIED
Science Foundation, IrelandUNSPECIFIED
INFN (Italy)UNSPECIFIED
NRF and WCU (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 (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 Czech RepublicUNSPECIFIED
Council of Science and Industrial Research, IndiaUNSPECIFIED
Compagnia di San Paolo (Torino)UNSPECIFIED
HOMING PLUS programme of Foundation for Polish Science UNSPECIFIED
Regional Development FundUNSPECIFIED
Thalis and Aristeia programmes cofinanced by EU-ESFUNSPECIFIED
Greek NSRFUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Subject Keywords:CMS; SUSY; Stop; Higgs
Record Number:CaltechAUTHORS:20141017-090018333
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141017-090018333
Official Citation:CMS Collaboration, Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at, Physics Letters B, Volume 736, 7 September 2014, Pages 371-397, ISSN 0370-2693, http://dx.doi.org/10.1016/j.physletb.2014.07.053. (http://www.sciencedirect.com/science/article/pii/S0370269314005553)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50476
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:17 Oct 2014 17:19
Last Modified:18 Dec 2014 19:34

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