Nonrenormalizable superpotential in four-dimensional string models |
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Authors: | G. G. Volkov A. A. Maslikov H. D. Dahmen T. Stroh |
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Affiliation: | (1) Department of Physics, Siegen University, D-57068 Siegen, Germany;(2) Institute for High Energy Physics, Protvino, Moscow oblast, 142284, Russia |
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Abstract: | A construction of an effective nonrenormalizable superpotential has been discussed within the approach of a four-dimensional heterotic superstring with free fermions on the world sheet. On the basis of N=2 superconformal theory, useful selection rules that take into account all global symmetries have been obtained within the formalism of covariant vertices and the ghost-picture-changing operation. The results have been applied to the model featuring the effective observable gauge group U(5)×U(3)H, which includes the non-Abelian horizontal group and which describes (3+1) generation. The full superpotential of the model up to sixth order inclusive has been obtained, and its coupling constants have been calculated. The quark-lepton mass spectrum of the model has been discussed with allowance for contributions from nonrenormalizable terms. |
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