The Minimal supersymmetric Standard Model is the supersymmetric extension of the Standard Model with two Higgs doublets and the minimal superpartner field content needed for a renormalizable theory.
R-parity is the multiplicative quantum number . Standard Model particles are even and their superpartners are odd.
R-parity violation permits interactions containing an odd number of superpartners. Renormalizable R-parity-violating interactions can violate lepton number or baryon number, and allowing both generically induces rapid proton decay.
In the MSSM, superpartners change the three Standard Model gauge beta functions so that the inverse gauge couplings meet accurately near GeV, up to threshold and higher-loop corrections. The corresponding Standard Model one-loop lines miss a common intersection.
Articles by others on the same topic
The Minimal Supersymmetric Standard Model (MSSM) is an extension of the Standard Model of particle physics that incorporates the principles of supersymmetry (SUSY). Supersymmetry is a theoretical symmetry between fermions (particles with half-integer spin, like electrons and neutrinos) and bosons (particles with integer spin, like photons and W/Z bosons). The MSSM proposes a partner particle for each particle in the Standard Model, effectively doubling the number of particles.