Summing one-loop graphs at multiparticle threshold
نویسندگان
چکیده
منابع مشابه
Summing one-loop graphs at multiparticle threshold.
It is shown that the technique recently suggested by Lowell Brown for summing the tree graphs at threshold can be extended to calculate the loop effects. Explicit result is derived for the sum of one-loop graphs for the amplitude of threshold production of n on-mass-shell particles by one virtual in the unbroken λφ 4 theory. It is also found that the tree-level amplitude of production of n part...
متن کاملComment on “ Summing one - loop graphs at multi - particle threshold ”
The propagator of a virtual φ-field with emission of n on-mass-shell particles all being exactly at rest is calculated at the tree-level in λφ 4 theory by directly solving recursion equations for the sum of Feynman graphs. It is shown that the generating function for these propagators is equivalent to a Fourier transform of the recently found Green's function within the background-field techniq...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1993
ISSN: 0556-2821
DOI: 10.1103/physrevd.47.r357