Abstract
We consider the pair production of vector-like down-type quarks in an E_6 motivated model, where each of the produced down-type vector-like quark decays into an ordinary Standard Model light quark and a singlet scalar. Both the vector-like quark and the singlet scalar appear naturally in the E_6 model with masses at the TeV scale with a favorable choice of symmetry breaking pattern. We focus on the non-standard decay of the vector-like quark and the new scalar which decays to two photons or two gluons. We analyze the signal for the vector-like quark production in the 2gamma +ge 2j channel and show how the scalar and vector-like quark masses can be determined at the Large Hadron Collider.
Highlights
Theories (GUTs) are known to present novel ideas in addressing the above issues in the Standard Model (SM) while proposing to unify the three SM gauge couplings to one at a high scale
We look at such an example in the E6 GUT model where one gets down-type vector-like (VL) fermions charged under an extra U (1) gauge symmetry
In this work we focus on an interesting signal of the down-type vector-like quark (VLQ) at Large Hadron Collider (LHC)
Summary
Theories (GUTs) are known to present novel ideas in addressing the above issues in the SM while proposing to unify the three SM gauge couplings to one at a high scale. Most of the GUT models have testable consequences at the TeV scale which are in the form of an extra gauge group such as an extra U (1) and some additional new particles with heavy masses. We look at such an example in the E6 GUT model where one gets down-type vector-like (VL) fermions charged under an extra U (1) gauge symmetry. The current experimental bounds on the mass of down-type VLQ are obtained under a certain assumption of its decay modes [28,29,30,31,32,33,34].
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