Seodong Shin

Singlet fermionic dark matter

We propose a renormalizable model of a fermionic dark matter by introducing a gauge singlet Dirac fermion and a real singlet scalar. The bridges between the singlet sector and the standard model sector are only the singlet scalar interaction terms with the standard model Higgs field. The singlet fermion couples to the standard model particles through the mixing between the standard model Higgs and singlet scalar and is naturally a weakly interacting massive particle (WIMP). The measured relic abundance can be explained by the singlet fermionic dark matter as the WIMP within this model. Collider implication of the singlet fermionic dark matter is also discussed. Predicted is the elastic scattering cross section of the singlet fermion into target nuclei for a direct detection of the dark matter. Search of the direct detection of the dark matter provides severe constraints on the parameters of our model.

Singlet Fermionic Dark Matter explains DAMA signal

It has been suggested that, considering channeling effect, the order of a few GeV dark matters which are elastically scattered from detector nuclei might be plausible candidates reconciling the DAMA annual modulation signal with the results of other null experiments. We show that Singlet Fermionic Dark Matter can be such a dark matter candidate, simultaneously providing the correct thermal relic density which is consistent with the WMAP data.

Effects of vectorlike leptons on

The mixing of new vectorlike leptons with leptons in the standard model can generate flavor violating couplings of

h\to 4\ell

h

and the connection to the muon g-2 anomaly

,

Boosted Dark Matter Quarrying at Surface Neutrino Detectors

W

Light neutralino dark matter with a very light Higgs boson for CoGeNT and DAMA/LIBRA data

and

D0 dimuon charge asymmetry from

Z

B_s

between heavy and light leptons. Focusing on the couplings of the muon, the partial decay width of

system with Z′ couplings and the recent LHCb result

h\to e_4^\pm \mu^\mp