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+0.9−0.8(stat.)±0.2(syst.))×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+23−20(stat.)+7−5(syst.)+3−2(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.
Observation of Z decays to four leptons with the CMS detector at the LHC
V. Sola;P. Meridiani;AMAPANE, Nicola Carlo;ARGIRO', Stefano;COSTA, Marco;MIGLIORE, Ernesto;MONACO, Vincenzo;MUSICH, MARCO;OBERTINO, Maria Margherita;PELLICCIONI, Mario;ROMERO, Alessandra;SACCHI, Roberto;SOLANO, Ada Maria;BELLAN, Riccardo;COVARELLI, Roberto;
2012-01-01
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+0.9−0.8(stat.)±0.2(syst.))×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+23−20(stat.)+7−5(syst.)+3−2(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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.