Freeze-In Dark Matter Search at Colliders with Jet Substructure Analysis

The non-thermally produced freeze-in dark matter is an attractive alternative to look beyond the weakly interacting massive particle (WIMP) paradigm. With the singlet-doublet dark matter model, a simple extension to the Standard Model (SM), we probe the light dark matter parameter space, assuming feeble couplings between SM particles and the dark matter candidate. We tried to show that in the non-standard cosmological background, a collider probe using jet substructure analysis can be very effective in terms of exclusion capability and serve as a complimentary probe to the existing displaced vertex searches.