Axino

Aksino (born axino ) is a hypothetical neutral elementary particle with spin 1/2 predicted by some theories of particle physics. The Peccei theory - Quinn is trying to explain the observed phenomenon, known as the strong CP problem , by introducing hypothetical real pseudoscalar particles, the so-called axions . Adding supersymmetry to this model makes it necessary to have a fermion superpartner for the axion — axino (with R parity −1), as well as a bosonic superpartner — saxion (with R parity +1). All of them form one chiral superfield. ^[one]

In some models, axino may be the lightest supersymmetric particle ^[2] , which is supposed to be stable. In particular, in connection with this property, axino is considered as one of the candidates for the role of particles that make up dark matter . ^{[3] [4] [5] [6]}