Search for resonant t t-bar production in lepton+jets events in pp collisions at sqrt(s)=7 TeV - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Journal of High Energy Physics Year : 2012

Search for resonant t t-bar production in lepton+jets events in pp collisions at sqrt(s)=7 TeV

S. Chatrchyan
  • Function : Author
Pierre Busson
R. Granier de Cassagnac
C. Mironov
P. Paganini
J.-L. Agram
C. Collard
E. Conte
P. van Hove
D. Contardo
M. Gouzevitch
M. Lethuillier
V. Sordini
P. Verdier
S. Viret

Abstract

A model-independent search is presented for the production of heavy resonances decaying into top-antitop quark pairs, seen as excesses above the standard model prediction in the t t-bar invariant mass spectrum. Events containing one lepton (muon or electron) and at least two jets are selected from data samples corresponding to 4.4-5.0 inverse femtobarns of integrated luminosity collected by the CMS experiment in pp collisions at sqrt(s) = 7 TeV at the LHC. Results are presented from the combination of two dedicated searches optimized for boosted production and production at threshold. No excess of events is observed over the expected yield from the standard model processes. Topcolor Z' bosons with narrow (wide) width are excluded at 95% confidence level for masses below 1.49 (2.04) TeV and an upper limit of 0.3 (1.3) pb or lower is set on the production cross section times branching fraction for resonance masses above 1 TeV. Kaluza-Klein excitations of a gluon with masses below 1.82 TeV (at 95% confidence level) in the Randall-Sundrum model are also excluded, and an upper limit of 0.7 pb or lower is set on the production cross section times branching fraction for resonance masses above 1 TeV.

Dates and versions

in2p3-00734206 , version 1 (21-09-2012)

Identifiers

Cite

S. Chatrchyan, M. Besancon, S. Choudhury, M. Dejardin, D. Denegri, et al.. Search for resonant t t-bar production in lepton+jets events in pp collisions at sqrt(s)=7 TeV. Journal of High Energy Physics, 2012, 12, pp.015. ⟨10.1007/JHEP12(2012)015⟩. ⟨in2p3-00734206⟩
30 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More