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Search for invisible particles produced in association with single-top-quarks in proton–proton collisions at √s=8TeV with the ATLAS detector

CollaborationWith : Alexandre, Gauthier / Ancu, Lucian Stefan / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Bucci, Francesca / Camacho Toro, Reina / Clark, Allan Geoffrey / Delitzsch, Chris Malena / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Goulette, Marc / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Mermod, Philippe / Miucci, Antonio / Muenstermann, Daniel / Nektarijevic, Snezana / Nikolics, Katalin / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Tykhonov, Andrii / Vallecorsa, Sofia / Wu, Xin
Published in European Physical Journal. C. 2015, vol. 75, no. 2, p. 79
Collection Open Access - SCOAP3
Abstract A search for the production of single-top-quarks in association with missing energy is performed in proton–proton collisions at a centre-of-mass energy of s=8TeV with the ATLAS experiment at the large hadron collider using data collected in 2012, corresponding to an integrated luminosity of 20.3  fb -1 . In this search, the W boson from the top quark is required to decay into an electron or a muon and a neutrino. No deviation from the standard model prediction is observed, and upper limits are set on the production cross-section for resonant and non-resonant production of an invisible exotic state in association with a right-handed top quark. In the case of resonant production, for a spin- 0 resonance with a mass of 500  GeV, an effective coupling strength above 0.15 is excluded at 95 % confidence level for the top quark and an invisible spin- 1/2 state with mass between 0 and 100  GeV. In the case of non-resonant production, an effective coupling strength above 0.2 is excluded at 95 % confidence level for the top quark and an invisible spin- 1 state with mass between 0 and 657  GeV.
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ATLAS COLLABORATION. Search for invisible particles produced in association with single-top-quarks in proton–proton collisions at √s=8TeV with the ATLAS detector. In: European Physical Journal. C, 2015, vol. 75, n° 2, p. 79. https://archive-ouverte.unige.ch/unige:55737

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Deposited on : 2015-04-27

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