Abstract
We construct a family of finite-dimensional representations of the superalgebra sl(n/m) that depend on an integer parameter for m > 1 and on a complex parameter, b, for m = 1. We describe some models of elementary particles for sl(2/1), sl(3/1), and sl(5/1). This involves the choice of the parameter b and the choice of the operators I3 (the third component of the weak left-handed isospin) and U (the weak hypercharge). These must commute, and are related to the electric charge by the usual formula Q = I3 + ½U. In particular, taking I3 to be in its standard form in su(2) ⊂ sl(5) ⊂ sl(5/1) and requiring that U commute with color su(3) ⊂ sl(5) ⊂ sl(5/1) leaves three free parameters, two for the choice of U and one for the choice of b. We show that there are just two possible choices of these parameters yielding exactly all 32 quark and lepton charges: the Georgi-Glashow U ∈ su(5), corresponding to U(1,-⅔) and arbitrary b and U(0,⅓) ∉ su(5), with b = 2. We provide a general construction of representations of sl(n/1) consisting exactly of sequences of generations of quarks and leptons.
Keywords: Lie superalgebras, fundamental representations, weak-electromagnetic charges, color, quark and lepton assignments
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