Search for exotic same-sign dilepton signatures (b' quark, T5/3 and four top quarks production) in 4.7 fb?1 of pp collisions at = 7 TeV with the ATLAS detector

5th International Workshop on Top Quark Physics

Gauthier, Léa^1

CEA-Saclay, France^1

关键词: ATLAS detectors;    Confidence levels;    Coupling constants;    Integrated luminosity;    Pair production;    Pp collisions;    Production cross section;    Production mechanisms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/452/1/012047/pdf
DOI  :  10.1088/1742-6596/452/1/012047

来源: IOP

【 摘 要 】

We present a search for pair production of down-type heavy quarks (b"), single and pair production of heavy top quark partners (T5/3q' and T5/35/3, respectively), and production of events containing four top quarks (ttt) in pp collisions at = 7 TeV recorded with the ATLAS detector at the LHC. For an integrated luminosity of 4.7 fb-1, the corresponding lower limit on both the b' and T5/3 mass is 0.67 TeV at 95% confidence level, when produced in pairs. When including the single production mechanism, limits on T5/3 production are 0.68 TeV and 0.70 TeV for a coupling constant of the tWT5/3 vertex equal to 1 and 3, respectively. The upper limit on the four top quarks production cross section is 61 fb at 95% confidence level.