Distinguishability of superstring E₆-inspired low-energy models and SU(5)_c color model

Abstract

We calculate the asymmetry parameters A, B, C_L,R in the deep-inelastic e-d and e-p scattering processes in the four effective low-energy models (referred to as χ, ψ, η, and alternative left-right-symmetric models) resulting from the breaking of the superstring-inspired E₆ model and the SU(5)_c model, and compared with those in the standard model. It is seen that χ and η models can be discriminated through the measurement of A and B parameters while C_L can differentiate the χ model only from the standard model. However, the alternative left-right-symmetric model and the SU(5)_c model cannot be distinguished from the standard model through measurement of A, B, and C_L parameters. Interestingly, all the models can be markedly distinguished from the standard model through the measurement of C_R for values of y in the range 0.38≤y≤0.42.