The R-parity reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

R-parity

R-parity is a concept in particle physics. In the extension of the Standard Model to include supersymmetry, baryon and lepton numbers of particles are no longer assumed to be conserved. Instead R-parity is assumed to be conserved, where the R-parity is

R = (-1)^2j+3B+L.

With spin j, baryons B, and leptons L. All Standard Model particles have R-parity of 1 while supersymmetric particles have R-parity -1.

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