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Search for Higgs boson decays to a photon and a Z boson in pp collisions at √s = 7 and 8 TeV with the ATLAS detector

CollaborationWith : Alexandre, Gauthier / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Bucci, Francesca / Camacho Toro, Reina / Clark, Allan Geoffrey / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Martin Dit Latour, Bertrand / Mermod, Philippe / Miucci, Antonio / Mora Herrera, Maria Clemencia Rosario / Muenstermann, Daniel / Nektarijevic, Snezana / Nikolics, Katalin / Pásztor, G. / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Vallecorsa, Sofia / Wu, Xin
Published in Physics Letters. B. 2014, vol. 732, p. 8-27
Collection Open Access - SCOAP3
Abstract A search is reported for a neutral Higgs boson in the decay channel H → Zγ, Z → ℓ+ℓ− (ℓ = e,μ), using 4.5 fb −1 of pp collisions at √s = 7 TeV and 20.3 fb −1 of pp collisions at √s = 8 TeV, recorded by the ATLAS detector at the CERN Large Hadron Collider. The observed distribution of the invariant mass of the three final-state particles, mℓℓγ, is consistent with the Standard Model hypothesis in the investigated mass range of 120–150 GeV. For a Higgs boson with a mass of 125.5 GeV, the observed upper limit at the 95% confidence level is 11 times the Standard Model expectation. Upper limits are set on the cross section times branching ratio of a neutral Higgs boson with mass in the range 120–150 GeV between 0.13 and 0.5 pb for √s = 8 TeV at 95% confidence level.
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ATLAS COLLABORATION. Search for Higgs boson decays to a photon and a Z boson in pp collisions at √s = 7 and 8 TeV with the ATLAS detector. In: Physics Letters. B, 2014, vol. 732, p. 8-27. doi: 10.1016/j.physletb.2014.03.015 https://archive-ouverte.unige.ch/unige:55809

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Deposited on : 2015-04-27

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