String-generated quartic scalar interactions
R. Marotta, F. Pezzella
Abstract
The cutting and sewing procedure is used for getting two-loop order Feynman diagrams of Φ4-theory with an internal SU(N) symmetry group, starting from tachyon amplitudes of the open bosonic string theory. In a suitably defined field theory limit, we reproduce the field theory amplitudes properly normalized and expressed in the Schwinger parametrization.
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