Up to present, neutralinos have never been observed or detected in an experiment.
Is a graviton a WIMP?
The gravitino is the spin-3/2 fermion SUSY partner to the, as yet undiscovered, graviton. Its weak gravitational coupling to matter, however, means it is almost impossible to directly detect, and so is a less favoured WIMP candidate at present.
What is an axion particle?
The axion is an hypothetical particle that appears in extensions of the Standard Model of Particle Physics that include the so-called Peccei-Quinn mechanism. The Peccei-Quinn mechanism was proposed to solve this problem in a natural way, without required parameter fine-tunning.
Are axions WIMPs?
Axions are even trickier than WIMPs. They’re theorized to be extremely light—a millionth of an electronvolt or so, about a trillion times lighter than the already tiny electron—making them next to impossible to produce or study in a traditional particle physics experiment.
Are WIMPs dark matter?
weakly interacting massive particle (WIMP), heavy, electromagnetically neutral subatomic particle that is hypothesized to make up most dark matter and therefore some 22 percent of the universe. The absence of light from these particles also indicates that they are electromagnetically neutral.
Are axions detected?
And according to a paper published in March, laboratory-made axions might have been detected for the first time by an experiment in Italy known as PVLAS (polarization of the vacuum with a laser). Axions are posited to have exceedingly low mass–less than a millionth that of an electron–and are electrically neutral.
Does Axion exist?
Theoretically, axions can be created by other particles colliding or exist naturally as dark matter, which physicists believe makes up a large percentage of the universe that we cannot directly see. The discovery of axions would answer many questions about dark matter and other particle physics mysteries.
Why is neutrino left-handed?
The relative orientations of spin and linear momentum for neutrinos and antineutrinos is apparently fixed and intrinsic to the particles. For neutrinos the spin is always opposite the linear momentum and this is referred to as “left-handed”, whereas the antineutrinos are always “right-handed”. …
What is a neutralino in supersymmetry?
In supersymmetry, the neutralino is a hypothetical particle. In the Minimal Supersymmetric Standard Model (MSSM), a popular model of realization of supersymmetry at a low energy, there are four neutralinos that are fermions and are electrically neutral, the lightest of which is stable in an R-parity conserved scenario of MSSM.
What is the difference between a neutrino and antineutrino?
An antineutrino is thus simply an “opposite version” of a neutrino. But if one of the main ways matter and antimatter are opposites is charge, then what does it mean that neutrinos are neutral? Does that mean neutrinos and antineutrinos are the same thing, only differing in the particles (positrons or electrons) produced along with them?
Is the neutralino a real particle?
Not to be confused with neutrino. In supersymmetry, the neutralino is a hypothetical particle.
Can neutralinos be observed or detected?
Up to present, neutralinos have never been observed or detected in an experiment. 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.
