Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. Any particle related to a more standard particle by supersymmetry.
Etymologies
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Examples

This theory suggests that every fundamental particle has a "superpartner" with a slightly different spin.

Tommaso Dorigo, an experimenter at the University of Padua in Italy, doubts that the LHC will find evidence of supersymmetry, a theoretical scheme that predicts a massive "superpartner" for every known particle in physicists 'current "standard model."

Supersymmetry solves this problem by providing a “superpartner” (the “stop quark”) which cancels the interaction with the top and keeps the higgs light.

The existence of the superpartner to the Higgs and the fermion field at about the same mass scale results in the cancellation of these divergences.

Physicists also hope to find evidence for new properties of nature, such as supersymmetry  the theory that every particle has an undiscovered "superpartner."

Last night before going to bed people here had me somewhat convinced that maybe there was more of a possibility of some weak kind of string theory prediction about ratios of superpartner masses than I had thought possible.

The ‘try to compute the superpartner mass spectrum’ part of string phenomenology is a relatively recent development, from 2005 onwards.

For any values of the superpartner parameters, I surely would start taking a lot more interest in the details of the various supersymmetry breaking schemes out there.

The natural prediction of supersymmetry is that all particles have a superpartner of equal mass.

In SUSY, the lightest superpartner of the SM particles (the LSP) can be neutral and rendered stable by the RParity symmetry.
Wordplayer commented on the word superpartner
Thanks deinonychus! I can add it too my particularlyinteresting list!
January 19, 2012
deinonychus commented on the word superpartner
In particle physics, a superpartner (also sparticle) is hypothetical elementary particle. Supersymmetry is one of the synergistic theories in current highenergy physics which predicts the existence of these "shadow" particles.
The word superpartner is a portmanteau of the words supersymmetry and partner (sparticle is a portmanteau of supersymmetry and particle).
(Wikipedia)
January 18, 2012