2003
DOI: 10.1016/j.physletb.2003.05.004
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Search for excited leptons at LEP

Abstract: A search for charged and neutral excited leptons is performed in 217 pb−1 of e+e− collision data collected with the L3 detector at LEP at centre-of-mass energies from 202 up to 209 GeV. The pair- and single-production mechanisms of excited electrons, muons and taus, as well as of excited electron-, muon- and tau-neutrinos, are investigated and no signals are detected. Combining with L3 results from searches at lower centre-of-mass energies, gives improved limits on the masses and couplings of excited leptons

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Cited by 32 publications
(22 citation statements)
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“…The H1 limits as a function of excited fermion mass are shown in figure 51, where they are compared to limits from LEP (excited electrons: [247,248], excited neutrinos: [249], excited quarks: [250]) and the Tevatron (excited electrons: [251]). Analyses from the LHC by ATLAS and CMS using their √ s = 8 TeV data have recently pushed these limits into a new mass regime, where, under the assumption f = f ′ = 1 and Λ = M f * , excited electrons (quarks) are ruled out by ATLAS at the 95% CL for masses lower than 2.2 TeV [252] (3.5 TeV [253]).…”
Section: H1mentioning
confidence: 99%
“…The H1 limits as a function of excited fermion mass are shown in figure 51, where they are compared to limits from LEP (excited electrons: [247,248], excited neutrinos: [249], excited quarks: [250]) and the Tevatron (excited electrons: [251]). Analyses from the LHC by ATLAS and CMS using their √ s = 8 TeV data have recently pushed these limits into a new mass regime, where, under the assumption f = f ′ = 1 and Λ = M f * , excited electrons (quarks) are ruled out by ATLAS at the 95% CL for masses lower than 2.2 TeV [252] (3.5 TeV [253]).…”
Section: H1mentioning
confidence: 99%
“…The scaling parameters f s , f , and f are assumed to be equal to one. Previous searches at LEP [4][5][6][7], HERA [8,9], and the Tevatron [10][11][12][13] have found no evidence for such excited leptons. Searches for qq contact interactions performed by studying the dilepton production at the Tevatron [14,15] and LHC [16] have resulted in lower limits on this search is the Drell-Yan production of + − pairs, accompanied by a photon radiated either by an initial-state parton (ISR) or from one of the final-state leptons (FSR).…”
Section: + (L → R)mentioning
confidence: 99%
“…The scaling parameters f s , f , and f are assumed to be equal to one. Previous searches at LEP [4][5][6][7], HERA [8,9], and the Tevatron [10-13] have found no evidence for such excited leptons. Searches for qq contact interactions performed by studying the dilepton production at the Tevatron [14,15] This Letter presents a search for excited leptons in pp collision data collected in 2010 at a centre-of-mass energy of 7 TeV with the Compact Muon Solenoid (CMS) [17] detector at the Large Hadron Collider (LHC).…”
mentioning
confidence: 99%
“…GeV [16]. Assuming f = f ′ and f /Λ = 1/m ⋆ , for single production of excited spin-1/2 neutrino in ep collisions taking into account all the decay channels, the H1 Collaboration set the exclusion limit for the mass range of excited neutrino m ⋆ > 213 GeV at 95% C.L.…”
Section: Introductionmentioning
confidence: 99%