摘要
InthispaperweproposeapossibleexplanationtotheFermionmasshierarchyproblembyfittingthetype-IIseesawmechanismintotheHiggsdoubletsector,suchthattheirvacuumexpectationvaluesarehierarchal.WeextendtheStandardModelwithtwoextraHiggsdoubletsaswellasaspontaneouslybrokenUX(1)gaugesymmetry.AllthefermionYukawacouplingsexceptthatofthetopquarkareofO(10~(-2))inourmodel.Constraintsontheparameterspaceofthemodelfromlowenergyprocessesarestudied.Besides,thelightestoneoftheneutralfermionfields,whichisintroducedtocanceltheanomaliesoftheU(1)Xgaugesymmetrycanbethecolddarkmattercandidate.Weinvestigateitssignatureinthedarkmatterdirectdetection.
出版日期
2016年09月19日（中国期刊网平台首次上网日期，不代表论文的发表时间）
