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In this work, we study the $SU(2)_L$ singlet complex scalar extended KSVZmodel that, in addition to providing a natural solution to the strong-CPproblem by including a global Peccei-Quinn symmetry, also furnishes twocomponents of dark matter that satisfy observer relic density withoutfine-tuning of model parameters. Furthermore, this model provides a richphenomenology by introducing a vector-like quark whose presence can be sensedin collider experiments and dark matter production mechanisms. We explore thepossibility of democratic Yukawa interaction of the vector-like quark with allup-type quarks and scalar dark matter candidate. We also employ next-to-leadingorder NLO-QCD correction for VLQ pair production to study a unique search atthe LHC, generating a pair of boosted tops with sizeable missing transversemomentum. Multivariate analysis with jet substructure variables has a strongability to explore a significant parameter space of this model at the 14 TeVLHC.

Precision prediction at the LHC of a democratic up-family philic KSVZ axion model