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

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Blondel, Alain / Bucci, Francesca / Clark, Allan Geoffrey / Dao, Valerio / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Iacobucci, Giuseppe / La Rosa, Alessandro / Leger, Annie / Lister, Alison / Martin Dit Latour, Bertrand / Mermod, Philippe / Mora Herrera, Maria Clemencia Rosario / Nektarijevic, Snezana / Nikolics, Katalin / Pasztor, Arpad / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Rosselet, Laurent / Wu, Xin
Published in Physics Letters. B. 2012, vol. 712, no. 4-5, p. 331-350
Abstract 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 √s=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 k/mpl=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 σfid(pp→X→ZZ)<0.92pb at 95% confidence level for any new sources of ZZ production with mZZmZZ greater than 300 GeV.
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ATLAS COLLABORATION. Search for new particles decaying to ZZ using final states with leptons and jets with the ATLAS detector in √s=7 TeV proton–proton collisions. In: Physics Letters. B, 2012, vol. 712, n° 4-5, p. 331-350. https://archive-ouverte.unige.ch/unige:39748

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Deposited on : 2014-08-26

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