= R-parity
{c}
{title2=$R_p$}
{wiki}
R-parity is the multiplicative number $R_p=(-1)^{3(B-L)+2s}$, where $B$ is <baryon number>, $L$ is <lepton number> and $s$ is <spin>. <Standard Model> <particles> are even and their <superpartners> are odd.
If conserved, an initially even state produces an even number of odd states, and the lightest odd state is stable. A neutral stable state may escape a detector and give <missing transverse momentum>. Stability alone does not establish its cosmological <supersymmetric relic abundance requires additional assumptions>[relic abundance].<A Supersymmetry Primer by Stephen P. Martin>[Section 6.2: multiplicative parity, production and stability consequences]{ref}
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