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Encyclopedia > Axino

The axino is a hypothetical elementary particle predicted by some theories of particle physics. Peccei-Quinn theory attempts to explain the observed phenomenon known as the strong CP problem by introducing a hypothetical real scalar particle called the axion. Adding supersymmetry to the model predicts the existence of a fermionic superpartner for the axion, the axino and a bosonic superpartner the saxion. They are all bundled up in a chiral superfield. In particle physics, an elementary particle or fundamental particle is a particle not known to have substructure; that is, it is not made up of smaller particles. ... Thousands of particles explode from the collision point of two relativistic (100 GeV per ion) gold ions in the STAR detector of the Relativistic Heavy Ion Collider. ... In particle physics, the Peccei-Quinn theory is the most famous proposed solution to the strong CP problem, involving new particles called axions. ... In particle physics, the strong CP problem is the puzzling question why Quantum Chromodynamics (QCD) does not seem to break the CP-symmetry. ... The axion is an exotic subatomic particle postulated by Peccei-Quinn theory to resolve the strong-CP problem in quantum chromodynamics (QCD). ... This article or section is in need of attention from an expert on the subject. ... Fermions, named after Enrico Fermi, are particles which form totally-antisymmetric composite quantum states. ... In supersymmetry, it is proposed that every fermion should have a partner boson, known as its Superpartner. ... In theoretical physics, one often analyzes theories with supersymmetry in which chiral superfields play an important role. ...

The axino has been predicted to be the lightest supersymmetric particle in such a model.[1] In part due to this property, it is considered a candidate for the composition of dark matter.[2] In particle physics, the Lightest Supersymmetric Particle (LSP) is the generic name given to the lightest of the additional hypothetical particles found in supersymmetric models. ... In astrophysics and cosmology, dark matter refers to hypothetical matter of unknown composition that does not emit or reflect enough electromagnetic radiation to be observed directly, but whose presence can be inferred from gravitational effects on visible matter. ...


  1. ^ Abe, Nobutaka, Takeo Moroi and Masahiro Yamaguchi (Jan 2002). "Anomaly-Mediated Supersymmetry Breaking with Axion". Journal of High Energy Physics (2002). 
  2. ^ Hooper, Dan and Lian-Tao Wang (2004-09-03). "Possible evidence for axino dark matter in the galactic bulge". Physical Review D (70). 



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