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In particle physics, for models with N=1 supersymmetry a higgsino, symbol H͂ , is the superpartner of the Higgs field. A higgsino is a Dirac fermionic field with spin 1⁄2 and it refers to a weak isodoublet with hypercharge half under the Standard Model gauge symmetries. After electroweak symmetry breaking higgsino fields linearly mix with U(1) and SU(2) gauginos leading to four neutralinos and two charginos[1] that refer to physical particles. While the two charginos are charged Dirac fermions (plus and minus each), the neutralinos are electrically neutral Majorana fermions. In an R-parity-conserving version of the Minimal Supersymmetric Standard Model, the lightest neutralino typically becomes the lightest supersymmetric particle (LSP). The LSP is a particle physics candidate for the dark matter of the universe since it cannot decay to particles with lighter mass. A neutralino LSP, depending on its composition can be bino, wino or higgsino dominated in nature[2] and can have different zones of mass values in order to satisfy the estimated dark matter relic density. Commonly, a higgsino dominated LSP is often referred as a higgsino, in spite of the fact that a higgsino is not a physical state in the true sense.
In natural scenarios of SUSY, top squarks, bottom squarks, gluinos, and higgsino-enriched neutralinos and charginos are expected to be relatively light, enhancing their production cross sections. Higgsino searches have been performed by both the ATLAS and CMS experiments at the Large Hadron Collider at CERN, where physicists have searched for the direct electroweak pair production of Higgsinos. As of 2017, no experimental evidence for Higgsinos has been reported.[3][4]
^resulting from electroweak symmetry breaking of the bino and wino 0, 1, 2
^"112. Supersymmetry, Part I (Theory)" (PDF). Particle Data Group. Revised by Howard E. Haber. 1 December 2017. Retrieved 3 November 2023.{{cite web}}: CS1 maint: others (link)
^"ATLAS Supersymmetry Public Results". ATLAS, CERN. Retrieved 2014-03-25.
^"CMS Supersymmetry Public Results". CMS, CERN. Retrieved 2014-03-25.
physics, for models with N=1 supersymmetry a higgsino, symbol H͂ , is the superpartner of the Higgs field. A higgsino is a Dirac fermionic field with spin 1⁄2...
soft terms like ϕ2ϕ∗{\displaystyle \phi ^{2}\phi ^{*}} and an explicit Higgsino soft mass term like ψψ{\displaystyle \psi \psi } in the Lagrangian. The...
neutral wino (which are the neutral electroweak gauginos), and the neutral higgsinos. As the neutralinos are Majorana fermions, each of them is identical to...
of the Gluon Gravitino – as a superpartner of the hypothetical graviton Higgsino – as a superpartner of the Higgs Field Neutralino Langacker, Paul (November...
a tripletino of mass M. The sfermions will then exchange a gaugino or Higgsino or gravitino leaving two fermions. The overall Feynman diagram has a loop...
mixes with the superpartners of the Z boson (zino) and the neutral higgs (higgsino) to form the neutralino. Supersymmetry – Symmetry between bosons and fermions...
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