Two-loop scalar diagrams from string theory

Details Two-loop scalar diagrams from string theory Two-loop scalar diagrams from string theory

1996-07-17

arxiv.org/abs/hep-th/9607141v1

Phys.Lett. B388 (1996) 65-76

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, plain Latex, 5 figures included

Scientific paper

10.1016/0370-2693(96)01137-9

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.

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