Searches for Heavy Quarks at the ATLAS experiment

3rd Symposium on Prospects in the Physics of Discrete Symmetries

Succurro, Antonella^1

Institut de Física d'Altes Energies, Edifici Cn, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain^1

关键词: ATLAS experiment;    Center-of-mass energies;    Confidence levels;    Heavy-quark;    Hierarchy problem;    New physics;    Proton proton collisions;    The standard model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/447/1/012047/pdf
DOI  :  10.1088/1742-6596/447/1/012047

来源: IOP

【 摘 要 】

During 2011 the ATLAS experiment at CERN collected around 5 fb-1of proton-proton collision data from the LHC at the center-of-mass energy of = 7 TeV. At such high energy frontier it is possible to explore possible new physics scenarios. Amongst the models of physics beyond the Standard Model (SM) some predict the existence of exotic heavy quarks, which would help to explain matter-antimatter asymmetry and to solve the hierarchy problem. Several analyses at ATLAS were performed to search for a chiral 4th generation of quarks with charges +2/3 and -1/3 (t' and b' respectively) and for vector-like quarks with charges of +2/3, -1/3, +5/3, -4/3, coming in singlets or doublets depending on the model. The recent discovery of a Higgs-like, SM-like boson with mass of ∼ 125 GeV makes the vector-like quark scenario the most interesting one. The status of these searches and the limits set at 95% Confidence Level (CL) are presented.