Search for new particles decaying to ZZ using final states with leptons and jets with the ATLAS detector in root s=7 TeV proton-proton collisions

• Main Author: Onofre, A.
• Publication Date: 2012
• Other Authors: Castro, Nuno Filipe Silva Fernandes, ATLAS Collaboration
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: https://hdl.handle.net/1822/48770
• topic: Ciências Naturais::Ciências Físicas; Ciências Naturais::Ciências Físicas; Science & Technology

A search is presented for a narrow resonance decaying to a pair of Z bosons using data corresponding to 1.02 fb−11.02 fb−1 of integrated luminosity collected by the ATLAS experiment from pp collisions at View the MathML sources=7 TeV. Events containing either four charged leptons (ℓℓℓℓℓℓℓℓ) or two charged leptons and two jets (ℓℓjjℓℓjj) are analyzed and found to be consistent with the Standard Model background expectation. Lower limits on a resonance mass are set using the Randall–Sundrum (RS1) graviton model as a benchmark. Using both ℓℓℓℓℓℓℓℓ and ℓℓjjℓℓjj events, an RS1 graviton with View the MathML sourcek/m¯pl=0.1 and mass between 325 and 845 GeV is excluded at 95%95% confidence level. In addition, the ℓℓℓℓℓℓℓℓ events are used to set a model-independent fiducial cross section limit of View the MathML sourceσfid(pp→X→ZZ)<0.92pb at 95% confidence level for any new sources of ZZ production with mZZmZZ greater than 300 GeV.