DR. CHENG-YANG LEE

The fermionic fields constructed from Elko (a complete set of Majorana spinors) have several unexpected properties. They satisfy the Klein-Gordon but not the Dirac equation and are of mass dimension one instead of three-half. In this talk, we provide a self-contained review on the theoretical construct of Elko and mass dimension one fermion. We then proceed to consider their symmetries and interactions. We show that the mass dimension one fermions have limited interactions with the Standard Model (SM) particles thus making them natural dark matter candidates. One possible interaction with the SM sector is through the Higgs boson via the Yukawa interaction. By studying the loop corrections induced by the Yukawa interaction and taking the mass of the Higgs boson to be 125 GeV, we show that the mass of the fermion must be at least 62.5 GeV.