A search for excited leptons in pp collisions at root s=7 TeV


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Chatrchyan S., Khachatryan V., Sirunyan A. M., Tumasyan A., Adam W., Bergauer T., ...Daha Fazla

PHYSICS LETTERS B, cilt.704, sa.3, ss.143-162, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 704 Sayı: 3
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.physletb.2011.09.021
  • Dergi Adı: PHYSICS LETTERS B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.143-162
  • Anahtar Kelimeler: CMS, Physics, E(+)E(-) COLLISIONS, EP COLLISIONS, FERMIONS, QUARK
  • Çukurova Üniversitesi Adresli: Evet

Özet

A search for excited leptons is carried out with the CMS detector at the LHC, using 36 pb(-1) of pp collision data recorded at root s = 7 TeV. The search is performed for associated production of a lepton and an oppositely charged excited lepton pp -> ll*, followed by the decay l* -> l gamma, resulting in the eey final state, where l = e, mu. 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 A 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. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.