TY - JOUR
T1 - Two-loop scalar diagrams from string theory
AU - Di Vecchia, Paolo
AU - Magnea, Lorenzo
AU - Lerda, Alberto
AU - Marotta, Raffaele
AU - Russo, Rodolfo
PY - 1996/11/7
Y1 - 1996/11/7
N2 - We show how to obtain correctly normalized expressions for the Feynman diagrams of Φ3 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 Φ3 theory, in preparation for the more interesting case of multiloop amplitudes of non-abelian gauge theories.
AB - We show how to obtain correctly normalized expressions for the Feynman diagrams of Φ3 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 Φ3 theory, in preparation for the more interesting case of multiloop amplitudes of non-abelian gauge theories.
UR - http://www.scopus.com/inward/record.url?scp=0002584409&partnerID=8YFLogxK
U2 - 10.1016/0370-2693(96)01137-9
DO - 10.1016/0370-2693(96)01137-9
M3 - Article
SN - 0370-2693
VL - 388
SP - 65
EP - 76
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1
ER -