http://SaturnianCosmology.Org/ mirrored file For complete access to all the files of this collection see http://SaturnianCosmology.org/search.php ========================================================== Neutralino From Wikipedia, the free encyclopedia Question book-new.svg This article *does not cite any references or sources *. Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . /(December 2009)/ In particle physics , the *neutralino* is a hypothetical particle predicted by supersymmetry . There are four neutralinos that are fermions and are electrically neutral, the lightest of which is typically stable. They are typically labeled N͂01 (the lightest), N͂02, N͂03 and N͂04 (the heaviest) although sometimes \tilde{\chi}_1^0, \ldots, \tilde{\chi}_4^0 is also used when \tilde{\chi}_i^\pm is used to refer to charginos . These four states are mixtures of the Bino and the neutral Wino (which are the neutral electroweak Gauginos ), and the neutral Higgsinos . As the neutralinos are Majorana fermions , each of them is identical with its antiparticle . Because these particles only interact with the weak vector bosons, they are not directly produced at hadron colliders in copious numbers. They primarily appear as particles in cascade decays of heavier particles (decays that happen in multiple steps) usually originating from colored supersymmetric particles such as squarks or gluinos . In R-parity conserving models, the lightest neutralino is stable and all supersymmetric cascades decays end up decaying into this particle which leaves the detector unseen and its existence can only be inferred by looking for unbalanced momentum in a detector. The heavier neutralinos typically decay through a neutral Z boson to a lighter neutralino or through a charged W boson to chargino: N͂02 → N͂01 + Z^0 → Missing energy + l^+ + l^− N͂02 → C͂±1 + W^∓ → N͂01 + W^± + W^∓ → Missing energy + l^+ + l^− The mass splittings between the different Neutralinos will dictate which patterns of decays are allowed. Contents [hide ] * 1 Origins in supersymmetric theories * 2 Phenomenology * 3 Relationship to dark matter * 4 See also [edit ] Origins in supersymmetric theories In supersymmetry models, all Standard Model particles have partner particles with the same quantum numbers except for the quantum number spin , which differs by 1/2 from its partner particle. Since the superpartners of the Z boson (zino ), the photon (photino ) and the neutral higgs (higgsino ) have the same quantum numbers, they can mix to form four eigenstates of the mass operator called "neutralinos". In many models the lightest of the four neutralinos turns out to be the lightest supersymmetric particle (LSP), though other particles may also take on this role. [edit ] Phenomenology The exact properties of each neutralino will depend on the details of the mixing (e.g. whether they are more higgsino-like or gaugino-like), but they tend to have masses at the weak scale (100 GeV - 1 TeV) and couple to other particles with strengths characteristic of the weak interaction . In this way they are phenomenologically similar to neutrinos , and so are not directly observable in particle detectors at accelerators. In models in which R-parity is conserved and the lightest of the four neutralinos is the LSP, the lightest neutralino is stable and is eventually produced in the decay chain of all other superpartners. In such cases supersymmetric processes at accelerators are characterized by a large discrepancy in energy and momentum between the visible initial and final state particles, with this energy being carried off by a neutralino which departs the detector unnoticed. This is an important signature to discriminate supersymmetry from Standard Model backgrounds. [edit ] Relationship to dark matter As a heavy, stable particle, the lightest neutralino is an excellent candidate to comprise the universe's cold dark matter . In many models the lightest neutralino can be produced thermally in the hot early universe and leave approximately the right relic abundance to account for the observed dark matter . A lightest neutralino of roughly 10-10000 GeV is the leading weakly interacting massive particle (WIMP ) dark matter candidate. Neutralino dark matter could be observed experimentally in nature either indirectly or directly. In the former case, gamma ray and neutrino telescopes look for evidence of neutralino annihilation in regions of high dark matter density such as the galactic or solar center. In the latter case, special purpose experiments such as the Cryogenic Dark Matter Search (CDMS) seek to detect the rare impacts of WIMPs in terrestrial detectors. These experiments have begun to probe interesting supersymmetric parameter space, excluding some models for neutralino dark matter, and upgraded experiments with greater sensitivity are under development. [edit ] See also * Lightest Supersymmetric Particle * Real neutral particle [hide ] v • d • e Particles in physics Elementary Fermions Quarks u · d · c · s · t · b Leptons e^− · e^+ · μ^− · μ^+ · τ^− · τ^+ · ν_e · ν_e · ν_μ · ν_μ · ν_τ · ν_τ Bosons Gauge γ · g · W^± · Z Others Ghosts Hypothetical Superpartners Gauginos Gluino · Gravitino Others Axino · Bosino · Chargino · Higgsino · *Neutralino* · Sfermion Others A^0 · Dilaton · G · H^0 · J · Tachyon · X · Y · W' · Z' · Sterile neutrino Composite Hadrons Baryons / Hyperons N (p · n ) · Δ · Λ · Σ · Ξ · Ω Mesons / Quarkonia π · ρ · η · η′ · φ · ω · J/ψ · ϒ · θ · K · B · D · T Others Atomic nuclei · Atoms · Exotic atoms (Positronium · Muonium · Onia ) · Molecules Hypothetical Exotic hadrons Exotic baryons Dibaryon · Pentaquark Exotic mesons Glueball · Tetraquark Others Mesonic molecule · Pomeron Quasiparticles Davydov soliton · Exciton · Magnon · Phonon · Plasmon · Polariton · Polaron · Roton Lists List of particles · List of quasiparticles · List of baryons · List of mesons · Timeline of particle discoveries