Search for a heavy top-quark partner in final states with two leptons with the ATLAS detector at the LHC
JOURNAL OF HIGH ENERGY PHYSICS, no.11, 2012 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Publication Date: 2012
- Doi Number: 10.1007/jhep11(2012)094
- Journal Name: JOURNAL OF HIGH ENERGY PHYSICS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Keywords: Hadron-Hadron scattering
- Open Archive Collection: AVESIS Open Access Collection
- Ankara University Affiliated: Yes
Abstract
The results of a search for direct pair production of heavy top-quark partners in 4.7 fb(-1) of integrated luminosity from pp collisions at root s = 7 TeV collected by the ATLAS detector at the LHC are reported. Heavy top-quark partners decaying into a top quark and a neutral non-interacting particle are searched for in events with two leptons in the final state. No excess above the Standard Model expectation is observed. Limits are placed on the mass of a supersymmetric scalar top and of a spin-1/2 top-quark partner. A spin-1/2 top-quark partner with a mass between 300 GeV and 480 GeV, decaying to a top quark and a neutral non-interacting particle lighter than 100 GeV, is excluded at 95% confidence level.