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Search for ZZ ' Resonances Decaying to ttˉt\bar{t} in Dilepton + Jets Final States in pppp Collisions at s=7\sqrt{s}=7 TeV

Collaboration
Nov, 2012
18 pages
Published in:
  • Phys.Rev.D 87 (2013) 7, 072002
  • Published: Apr 3, 2013
e-Print:
DOI:
Report number:
  • CMS-TOP-11-010,
  • CERN-PH-EP-2012-324
Experiments:
View in:
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Abstract: (APS)
A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton+jets data sample recorded by the CMS experiment at the LHC in pp collisions at s=7  TeV corresponding to an integrated luminosity of 5.0  fb-1. No significant deviations from the standard model background are observed. Upper limits are presented for the production cross section times branching fraction of top quark-antiquark resonances for masses from 750 to 3000 GeV. In particular, the existence of a leptophobic topcolor particle Z′ is excluded at the 95% confidence level for resonance masses MZ′<1.3  TeV for ΓZ′=0.012MZ′, and M<1.9  TeV for ΓZ′=0.10MZ′.
Note:
  • Replaced with published version. Added journal reference
  • 13.85.Rm
  • 12.60.Cn
  • 14.65.Ha
  • p p: scattering
  • quark antiquark: resonance
  • top: pair production
  • jet: multiple production
  • dilepton: final state
  • CERN LHC Coll
  • background
  • [TeV]
    Z'M 0.8 1 1.2 1.4 1.6 1.8 2 )
    • [pb]
      tt→B(Z'×Z' σUpperlimiton -1 10 1 10 2 10 Observed (95% CL)S CL Expected (95% CL)S CL Expectedσ1± Expectedσ2± = 0.012)Z'/MZ'ΓZ' ( = 7 TeVsat-1 5.0 fb CMS
      • [TeV]
        Z'M 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 )
        • [pb]
          tt→B(Z'×Z'σUpperlimiton -1 10 1 10 2 10 Observed (95% CL)S CL Expected (95% CL)S CL Expectedσ1± Expectedσ2± = 0.10)Z'/MZ'ΓZ' ( = 7 TeVsat-1 5.0 fb CMS