Two-loop scalar diagrams from string theory

Abstract

We show how to obtain correctly normalized expressions for the Feynman diagrams of ${\Phi }^3$ theory with an internal $U(N)$ symmetry group, starting from tachyon amplitudes of the open bosonic string, and suitably performing the zero--slope limit by giving an arbitrary mass $m$ to the tachyon. In particular we present explicit results for the two--loop amplitudes of ${\Phi }^3$ theory, in preparation for the more interesting case of the multiloop amplitudes of non--abelian gauge theories.

15 pages, plain Latex, 5 figures included

References in corpus (2)

• Multi-Parton Amplitudes in Gauge Theories
• String techniques for the calculation of renormalization constants in field theory

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