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A large class of broken supersymmetry theories is shown to imply the existence of fermions λ^± and λ⁰, lighter than or nearly degenerate with the W^± and Z⁰ gauge bosons, and with vanishing baryon and lepton number. If the λ^± is appreciably lighter than the W^± it can be readily produced in W^± decay, as well as in e⁺-e^- collisions.
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Steven Weinberg (1983) studied this question.
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