Search for Invisible Particles Produced in Association With Single-Top-Quarks in Proton–proton Collisions at √s = 8 TeV With the ATLAS Detector
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Date
2015
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Springer Nature
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Citation
ATLAS Collaboration. 2015. “Search for Invisible Particles Produced in Association With Single-Top-Quarks in Proton–proton Collisions at √s = 8 TeV With the ATLAS Detector.” The European Physical Journal C 75 (2) (February). doi:10.1140/epjc/s10052-014-3233-4.
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 = 8 TeV 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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