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Search for heavy lepton resonances decaying to a Z boson and a lepton in pp collisions at root s=8 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2828
2015 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 8, 148Article in journal (Refereed) Published
Abstract [en]

A search for heavy leptons decaying to a Z boson and an electron or a muon is presented. The search is based on pp collision data taken at root s = 8TeV by the ATLAS experiment at the CERN Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb(-1). Three high-transverse-momentum electrons or muons are selected, with two of them required to be consistent with originating from a Z boson decay. No significant excess above Standard Model background predictions is observed, and 95% confidence level limits on the production cross section of high-mass trilepton resonances are derived. The results are interpreted in the context of vector-like lepton and type-III seesaw models. For the vector-like lepton model, most heavy lepton mass values in the range 114-176 GeV are excluded. For the type-III seesaw model, most mass values in the range 100-468 GeV are excluded.

Place, publisher, year, edition, pages
Societa Italiana di Fisica , 2015. no 8, 148
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-177837DOI: 10.1007/JHEP09(2015)108ISI: 000363539700001Scopus ID: 2-s2.0-84942309326OAI: oai:DiVA.org:kth-177837DiVA: diva2:874480
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 20151127

Available from: 2015-11-27 Created: 2015-11-27 Last updated: 2017-12-01Bibliographically approved

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Strandberg, Jonas

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