Superpartners in String Theory

Part of the String Theory For Dummies Cheat Sheet

String theory’s concept of supersymmetry is a fancy way of saying that each particle has a related particle called a superpartner. Keeping track of the names of these superpartners can be tricky, so here are the rules in a nutshell.

  • The superpartner of a fermion begins with an “s,” so the superpartner of an “electron” is the “selectron” and the superpartner of the “quark” is the “squark.”

  • The superpartner of a boson ends in “–ino,” so the superpartner of a “photon” is the “photino” and of the “graviton” is the “gravitino.”

Use the following table to see some examples of the superpartner names.

Some Superpartner Names
Standard Particle Superpartner
Higgs boson Higgsino
Neutrino Sneutrino
Lepton Slepton
Z boson Zino
W boson Wino
Gluon Gluino
Muon Smuon
Top quark Stop squark
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