MSSMgaugino

MSSMgaugino refers to the fermionic superpartners of the gauge bosons in the Minimal Supersymmetric Standard Model (MSSM). Each gauge field has a spin-1/2 partner: the bino for the U(1)_Y hypercharge gauge boson, the winos for the SU(2)_L gauge bosons, and the gluino for the SU(3)_C gauge bosons. The gauginos obtain masses through soft supersymmetry-breaking terms, commonly denoted M1, M2, and M3, which set the mass scale for the bino, wino, and gluino, respectively. These masses, together with the Higgs sector, determine the physical mass eigenstates.

After electroweak symmetry breaking, the gauginos mix with the higgsinos (the superpartners of the Higgs fields) to form the neutralinos and charginos. Neutralinos χ̃^0_i (i = 1..4) are mixtures of bino, wino, and neutral higgsinos; charginos χ̃^±_i (i = 1,2) are mixtures of charged winos and charged higgsinos. The lightest neutralino is often the lightest supersymmetric particle (LSP) and a candidate for dark matter in R-parity conserving scenarios.

Gluinos are color-octet Majorana fermions and are typically heavier than electroweak gauginos in many models, but their masses depend on the SUSY-breaking mechanism. Gluinos interact with quarks and squarks and can be produced copiously at hadron colliders, producing characteristic multijet plus missing energy signatures when they decay.

Constraints from collider searches and dark matter experiments shape the allowed MSSM gaugino parameter space. In model-building, the pattern of M1, M2, M3 and the Higgsino mass parameter μ determines the mass spectrum and mixings, influencing collider signals and relic density calculations.