In supersymmetry, it is proposed that every fermion should have a "partner" boson, known as its Superpartner. No superpartners have yet been found, but it is hypothesized that they are only available at extremely high energy level. Discovery of such a particle is considered essential to proving Superstring theories or M-Theory. The addition of Supersymmetry to String Theory allowed it to describe fermions in addition to bosons, since the bosons described in string theory would necessarily have fermion superpartners.
A major obstacle to Einstein’s dream of a unified theory is the clash of the laws of the large with the laws of the small.
The lightest superpartner is a likely candidate for dark matter, thus perhaps also explaining the structure of the cosmos.
Linear collider experiments could focus on one type of superpartner at a time, measuring their properties cleanly enough to detect the symmetry of supersymmetry, and to reveal the supersymmetric nature of dark matter.
The symbols for the SM superpartners are the same as for the SM particles, but with an additional tilde.
To date, no superpartners of the SM particles have been discovered, so superpartner masses must be heavier than those of the SM particles.
The interaction of superpartners with the SM particles can be obtained from the usual SM gauge and Yukawa interactions by replace two of the SM particles with their superpartners.
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