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Standard Model ofparticle physics
Elementary particles of the Standard Model
Background Particle physics Standard Model Quantum field theory Gauge theory Spontaneous symmetry breaking Higgs mechanism
Constituents Electroweak interaction Quantum chromodynamics CKM matrix Standard Model mathematics
Limitations Strong CP problem Hierarchy problem Neutrino oscillations Physics beyond the Standard Model
Scientists Rutherford Thomson Chadwick Bose Sudarshan Davis Jr Anderson Fermi Dirac Feynman Rubbia Gell-Mann Kendall Taylor Friedman Powell Anderson Glashow Iliopoulos Lederman Maiani Meer Cowan Nambu Chamberlain Cabibbo Schwartz Perl Majorana Weinberg Lee Ward Salam Kobayashi Maskawa Mills Yang Yukawa 't Hooft Veltman Gross Pais Pauli Politzer Reines Schwinger Wilczek Cronin Fitch Vleck Higgs Englert Brout Hagen Guralnik Kibble de Mayolo Lattes Zweig
v t e

Inparticle physics, for models withN = 1 supersymmetry, ahiggsino, symbolH͂, is thesuperpartner of theHiggs field. A higgsino is aDirac fermionic field with spin⁠1/2⁠ and it refers to aweak isodoublet with hypercharge half under the Standard Model gauge symmetries. Afterelectroweak symmetry breaking higgsino fields linearly mix with U(1) and SU(2) gauginos leading to fourneutralinos and twocharginos^[1] that refer to physical particles. While the two charginos are charged Dirac fermions (plus and minus each), the neutralinos are electrically neutralMajorana fermions. In anR-parity-conserving version of theMinimal Supersymmetric Standard Model, the lightest neutralino typically becomes thelightest supersymmetric particle (LSP). The LSP is a particle physics candidate for thedark 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 theATLAS andCMS experiments at theLarge Hadron Collider atCERN, 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]

If dark matter is composed only of Higgsinos, then the Higgsino mass is 1.1 TeV. On the other hand, if dark matter has multiple components, then the Higgsino mass depends on the relevant multiverse distribution functions, making the mass of the Higgsino lighter.

m_ħ ≈ 1.1 (Ω_ħ/Ω_DM)^1/2 TeV^[5]

• Supersymmetric quantum field theory
• Fermions
• Hypothetical elementary particles

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