Search for baryon number violation in top-quark decays

CMS Collaboration; S Chatrchyan; V Khachatryan; A M Sirunyan; V Chiochia; B Kilminster; P Robmann; Yasar Onel

doi:10.1016/j.physletb.2014.02.033

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Search for baryon number violation in top-quark decays

Journal article

Open access

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Search for baryon number violation in top-quark decays

CMS Collaboration, S Chatrchyan, V Khachatryan, A M Sirunyan, V Chiochia, B Kilminster, P Robmann and Yasar Onel

Physics letters. B, Vol.73, pp.173-196

2014

DOI: 10.1016/j.physletb.2014.02.033

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Abstract

A search for baryon number violation (BNV) in top-quark decays is performed using pp collisions produced by the LHC at sqrt(s) = 8 TeV. The top-quark decay considered in this search results in one light lepton (muon or electron), two jets, but no neutrino in the final state. Data used for the analysis were collected by the CMS detector and correspond to an integrated luminosity of 19.5 inverse femtobarns. The event selection is optimized for top quarks produced in pairs, with one undergoing the BNV decay and the other the standard model hadronic decay to three jets. No significant excess of events over the expected yield from standard model processes is observed. The upper limits at 95% confidence level on the branching fraction of the BNV top-quark decay are calculated to be 0.0016 and 0.0017 for the muon and the electron channels, respectively. Assuming lepton universality, an upper limit of 0.0015 results from the combination of the two channels. These limits are the first that have been obtained on a BNV process involving the top quark.

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Details

Title: Subtitle: Search for baryon number violation in top-quark decays
Creators: CMS Collaboration
S Chatrchyan
V Khachatryan
A M Sirunyan
V Chiochia
B Kilminster
P Robmann
Yasar Onel (Contributor) - Physics and Astronomy
Resource Type: Journal article
Publication Details: Physics letters. B, Vol.73, pp.173-196
DOI: 10.1016/j.physletb.2014.02.033
ISSN: 0370-2693
eISSN: 1873-2445
Publisher: Elsevier
Grant note: name: BMWF; name: FWF; name: FNRS; name: FWO; name: CNPq; name: CAPES; name: FAPERJ; name: FAPESP; name: MES; name: CERN; name: CAS; name: MoST; name: NSF; name: COLCIENCIAS; name: MSES; name: RPF; name: MoER; name: SF0690030s09; name: ERDF; name: Academy of Finland; name: MEC; name: HIP; name: CEA; name: CNRS/IN2P; name: BMBF; name: DFG; name: HGF; name: GSRT; name: OTKA; name: NKTH; name: DAE; name: DST; name: IPM; name: SFI; name: INFN; name: NRF; name: WCU; name: LAS; name: CINVESTAV; name: CONACYT; name: SEP; name: UASLP-FAI; name: MBIE; name: PAEC; name: MSHE; name: NSC; name: FCT; name: JINR; name: MON; name: RosAtom; name: RAS; name: RFBR; name: MESTD; name: SEIDI; name: CPAN; name: Swiss Funding Agencies; name: NSC; name: ThEPCenter; name: IPST; name: STAR; name: NSTDA; name: TUBITAK; name: TAEK; name: NASU; name: STFC; name: DOE; name: NSF; name: Marie-Curie programme; name: European Research Council; name: EPLANET; name: Leventis Foundation; name: A.P. Sloan Foundation; name: Alexander von Humboldt Foundation; name: Belgian Federal Science Policy Office; name: Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture; name: Agentschap voor Innovatie door Wetenschap en Technologie; name: Ministry of Education, Youth and Sports (MEYS) of Czech Republic; name: Council of Science and Industrial Research; name: Compagnia di San Paolo (Torino); name: Foundation for Polish Science; name: EU, Regional Development Fund; name: Thalis and Aristeia programmes; name: EU-ESF; name: Greek NSRF
Language: English
Date published: 2014
Academic Unit: Physics and Astronomy
Record Identifier: 9984428835402771

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