The European Physical Journal C > 2015 > 75 > 2 > 1-24
Search for invisible particles produced in association with single-top-quarks in proton–proton collisions at $$\sqrt{s}=\mathrm {8~TeV}$$ s = 8 TeV with the ATLAS detector
Source
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 $$\sqrt{s}=\mathrm {8~TeV}$$ s = 8 TeV with the ATLAS experiment at the large hadron collider using data collected in 2012, corresponding to an integrated luminosity of $$20.3$$ 20.3 fb $$^{-1}$$ - 1 . In this search, the $$W$$ 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- $$0$$ 0 resonance with a mass of $$500$$ 500 GeV, an effective coupling strength above $$0.15$$ 0.15 is excluded at 95 $$\,\%$$ % confidence level for the top quark and an invisible spin- $$1/2$$ 1 / 2 state with mass between $$0$$ 0 and $$100$$ 100 GeV. In the case of non-resonant production, an effective coupling strength above $$0.2$$ 0.2 is excluded at 95 $$\,\%$$ % confidence level for the top quark and an invisible spin- $$1$$ 1 state with mass between $$0$$ 0 and $$657$$ 657 GeV.
Identifiers
journal ISSN : | 1434-6044 |
journal e-ISSN : | 1434-6052 |
DOI | 10.1140/epjc/s10052-014-3233-4 |