Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-12-12
Nucl.Phys. B604 (2001) 92-120
Physics
High Energy Physics
High Energy Physics - Phenomenology
37 pages, LaTeX. Revised version: 4 added references, some minor changes
Scientific paper
10.1016/S0550-3213(01)00187-0
We present a general algorithm to compute off-shell, one-loop multigluon Green functions using bosonic string amplitudes. We identify and parametrize the regions in the space of moduli of one-loop Riemann surfaces that contribute to the field theory limit of string amplitudes. Each of these regions can be precisely associated with a Feynman-like scalar graph with cubic and quartic vertices, whose lines represent the joint propagation of ghosts and gluons. We give a procedure to compute the contribution of each graph to a gluon Green function, for arbitrarily polarized off-shell gluons, reducible and irreducible diagrams, planar and non-planar topologies. Explicit examples are given for up to six gluons.
Frizzo Alberto
Magnea Lorenzo
Russo Rodolfo
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