*Speaker : Dr. Yeo Woong Yoon (Konkuk University)
*Abstract : A simple extension of the standard model with a singlet scalar has been spotlighted since it can help solve cosmological problems. We consider the extended standard model with additional vector-like quarks of both SU(2) doublet and singlet. We study the LHC phenomenology regarding the singlet scalar boson. We mainly focus on the special properties of the singlet scalar decays that are radiatively generated. We explain the condition in which the large longitudinal enhancement can happen through radiative decays.