Search for heavy narrow dilepton resonances in pp collisions at root s=7 TeV and root s=8 TeV

Chatrchyan S., Khachatryan V., Sirunyan A. M., Tumasyan A., Adam W., Aguilo E., ...More

PHYSICS LETTERS B, vol.720, pp.63-82, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 720
  • Publication Date: 2013
  • Doi Number: 10.1016/j.physletb.2013.02.003
  • Journal Name: PHYSICS LETTERS B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.63-82
  • Keywords: CMS, Physics, Resonances, Z ', Muons, Electrons, FERMION-PAIR PRODUCTION, E(+)E(-) COLLISIONS, CONSTRAINTS, PHYSICS
  • Middle East Technical University Affiliated: Yes


An updated search for heavy narrow resonances decaying to muon or electron pairs using the CMS detector is presented. Data samples from pp collisions at root s = 7 TeV and 8 TeV at the LHC, with integrated luminosities of up to 5.3 and 4.1 fb(-1), respectively, are combined. No evidence for a heavy narrow resonance is observed. The analysis of the combined data sets excludes, at 95% confidence level, a Sequential Standard Model Z '(SSM) resonance lighter than 2590 GeV, a superstring-inspired Z '(psi) lighter than 2260 GeV, and Kaluza-Klein gravitons lighter than 2390 (2030) GeV, assuming that the coupling parameter k/(M) over bar (Pl) is 0.10 (0.05). These are the most stringent limits to date. (C) 2013 CERN. Published by Elsevier B.V. All rights reserved.