In particle physics, a Higgsino, symbol , is the theoretical superpartner of the Higgs boson, as predicted by supersymmetry. The Higgsino is a Dirac fermion and that is a weak isodoublet with hypercharge half under the Standard Model gauge symmetries. After electroweak symmetry breaking the Higgsino becomes a pair of neutral Majorana fermions called neutralinos and a charged Dirac fermion called a chargino (plus and minus). These states finally mix with the neutralinos (photino and zino) and chargino (charged wino plus and minus) to form the predicted particles which are four neutralinos and two charginos (plus and minus each). Such a linear combination of the Higgsino, bino and wino makes up the lightest supersymmetric particle (LSP), which is a particle physics candidate for the dark matter of the universe. In order to be such a candidate, it must be neutral (i.e. a neutralino rather than chargino).