Search for invisible particles produced in association with single-top-quarks in proton-proton collisions at root s=8 TeV with the ATLAS detecto
Number of Authors: 2880
2015 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 75, no 2, 79Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2015. Vol. 75, no 2, 79
IdentifiersURN: urn:nbn:se:uu:diva-256792DOI: 10.1140/epjc/s10052-014-3233-4ISI: 000354545100001OAI: oai:DiVA.org:uu-256792DiVA: diva2:827091
ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-014-3233-42015-06-262015-06-262015-06-26Bibliographically approved