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Title: A search for excited leptons in pp Collisions at sqrt(s) = 7 TeV

Abstract

A search for excited leptons is carried out with the CMS detector at the LHC, using 36 inverse picobarns of pp collision data recorded at sqrt(s) = 7 TeV. The search is performed for associated production of a lepton and an oppositely charged excited lepton pp to l l*, followed by the decay l* to l gamma, resulting in the l l gamma final state, where l = electron or muon. No excess of events above the standard model expectation is observed. Interpreting the findings in the context of l* production through four-fermion contact interactions and subsequent decay via electroweak processes, first upper limits are reported for l* production at this collision energy. The exclusion region in the compositeness scale Lambda and excited lepton mass M(l*) parameter space is extended beyond previously established limits. For Lambda = M(l*), excited lepton masses are excluded below 1070 GeV/c^2 for e* and 1090 GeV/c^2 for mu* at the 95% confidence level.

Authors:
 [1];
  1. Yerevan Physics Inst. (Armenia)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1155758
Report Number(s):
FERMILAB-PUB-11-712-CMS; CERN-PH-EP-2011-081; CMS-EXO-10-016
Journal ID: ISSN 0370-2693; arXiv eprint number arXiv:1107.1773
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 704; Journal Issue: 3; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Chatrchyan, Serguei, and et al. A search for excited leptons in pp Collisions at sqrt(s) = 7 TeV. United States: N. p., 2011. Web. doi:10.1016/j.physletb.2011.09.021.
Chatrchyan, Serguei, & et al. A search for excited leptons in pp Collisions at sqrt(s) = 7 TeV. United States. doi:10.1016/j.physletb.2011.09.021.
Chatrchyan, Serguei, and et al. Sat . "A search for excited leptons in pp Collisions at sqrt(s) = 7 TeV". United States. doi:10.1016/j.physletb.2011.09.021. https://www.osti.gov/servlets/purl/1155758.
@article{osti_1155758,
title = {A search for excited leptons in pp Collisions at sqrt(s) = 7 TeV},
author = {Chatrchyan, Serguei and et al.},
abstractNote = {A search for excited leptons is carried out with the CMS detector at the LHC, using 36 inverse picobarns of pp collision data recorded at sqrt(s) = 7 TeV. The search is performed for associated production of a lepton and an oppositely charged excited lepton pp to l l*, followed by the decay l* to l gamma, resulting in the l l gamma final state, where l = electron or muon. No excess of events above the standard model expectation is observed. Interpreting the findings in the context of l* production through four-fermion contact interactions and subsequent decay via electroweak processes, first upper limits are reported for l* production at this collision energy. The exclusion region in the compositeness scale Lambda and excited lepton mass M(l*) parameter space is extended beyond previously established limits. For Lambda = M(l*), excited lepton masses are excluded below 1070 GeV/c^2 for e* and 1090 GeV/c^2 for mu* at the 95% confidence level.},
doi = {10.1016/j.physletb.2011.09.021},
journal = {Physics Letters. Section B},
issn = {0370-2693},
number = 3,
volume = 704,
place = {United States},
year = {2011},
month = {10}
}