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Constraints from lepton universality at the z-peak on unified theories

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	Bernabeu Alberola, José Perfil; Pilaftsis, Apostolos
	This document is a artículoDate1995
	Este documento está disponible también en : http://hdl.handle.net/10550/53252
	We suggest the use of a universality-breaking observable based on lepton asymmetries as derived from the left-right asymmetry and the τ polarization at the Z peak, which can efficiently constrain the parameter space of unified theories. The new observable is complementary to the leptonic partial width differences and it depends critically on the chirality of a possible non-universal Z-boson coupling to like-flavour leptons. The LEP/SLC potential of probing universality violation is discussed in representative low-energy extensions of the Standard Model (SM) that could be derived by supersymmetric grand unified theories, such as the SM with left-handed and/or right-handed neutral isosinglets, the left-right symmetric model, and the minimal supersymmetric SM.
	Bernabeu Alberola, José; Pilaftsis, Apostolos (1995) Constraints from lepton universality at the z-peak on unified theories Physics Letters B 351 1-3 235 241
	http://dx.doi.org/10.1016/0370-2693(95)00320-K