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Observation of Z decays to four leptons with the CMS detector at the LHC

Chatrchyan, S ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1007/JHEP12(2012)034
  3. Publisher: 2012
  4. Abstract:
  5. The first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 fb-1 at s=7 TeV collected by the CMS detector at the Large Hadron Collider. A pronounced resonance peak, with a statistical significance of 9.7 σ, is observed in the distribution of the invariant mass of four leptons (electrons and/or muons) with mass and width consistent with expectations for Z boson decays. The branching fraction and cross section reported here are defined by phase space restrictions on the leptons, namely, 80 < m 4ℓ < 100 GeV, where m 4ℓ is the invariant mass of the four leptons, and m ℓℓ > 4 GeV for all pairs of leptons, where m ℓℓ is the two-lepton invariant mass. The measured branching fraction is B({Z → 4ℓ)=({4.2-0.8 +0.9 (stat.)±0.2(syst.))×times 10-6 and agrees with the standard model prediction of 4.45 × 10-6. The measured cross section times branching fraction is σ (pp → Z)B(Z →4ℓ)=112-20 +23(stat.)-5 +7 (syst.)-2 +3 (lumi.) fb, also consistent with the standard model prediction of 120 fb. The four-lepton mass peak arising from Z → 4ℓ decays provides a calibration channel for the Higgs boson search in the H → ZZ → 4ℓ decay mode.[Figure not available: see fulltext
  6. Keywords:
  7. Hadron-Hadron Scattering
  8. Source: Journal of High Energy Physics ; Volume 2012, Issue 12 , December , 2012 ; 11266708 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2FJHEP12%282012%29034