Search for Single Production of Vector-like Quarks Coupling to Light Generations in 4.64 fb?1 of ATLAS Data at = 7 TeV

5th International Workshop on Top Quark Physics

Meehan, Samuel^1

Enrico Fermi Institute, University of Chicago, Chicago, IL, United States^1

关键词: ATLAS experiment;    Branching ratio;    Centre-of-mass energies;    Heavy quark productions;    Invariant mass;    Light generation;    Transverse momenta;    Transverse momentum jets;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/452/1/012054/pdf
DOI  :  10.1088/1742-6596/452/1/012054

来源: IOP

【 摘 要 】

This analysis presents a search for singly-produced vector-like quarks (VLQs) coupling to light quark generations in events with a W or Z boson produced in association with two or more high transverse momentum jets. The vector boson produced in the VLQ decay is reconstructed in the W → ν or Z →modes, whereis an electron or a muon. No evidence of VLQs is observed above the expected background in 4.64 fb-1of data taken in 2011 by the ATLAS experiment at the LHC at a centre-of-mass energy of 7 TeV. A fit to the distribution of the invariant mass of the system composed of the vector boson and the highest transverse momentum jet is used to set limits on the heavy quark production cross section times branching ratio, and mass bounds are obtained for three flavors of VLQs.