Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/5231
Title: Observation of Z decays to four leptons with the CMS detector at the LHC
Authors: CMS Collaboration
Karapınar, Güler
Keywords: Decays
Leptons
CMS detector
Large Hadron Collider (LHC)
Publisher: Springer Verlag
Source: Chatrchyan, S, Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Aguilo, E., Bergauer, T., ...CMS Collaboration (2012). Observation of Z decays to four leptons with the CMS detector at the LHC. Journal of High Energy Physics, 2012(12). doi:10.1007/JHEP12(2012)034
Abstract: 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.] © 2012 CERN for the benefit of the CMS collaboration.
URI: http://doi.org/10.1007/JHEP12(2012)034
http://hdl.handle.net/11147/5231
ISSN: 1029-8479
Appears in Collections:Mathematics / Matematik
Rectorate / Rektörlük
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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