Towards systematic near-threshold calculations in perturbative QFT

Details Towards systematic near-threshold calculations in perturbative QFT Towards systematic near-threshold calculations in perturbative QFT

1997-03-26

arxiv.org/abs/hep-ph/9703424v3

Phys.Lett. B412 (1997) 350-358

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 PS; 04.06.97: added universal definition of the scaling exponent n_kappa + misprints corrected; 07.11.98: maintenance

Scientific paper

10.1016/S0370-2693(97)01017-4

For any near-threshold asymptotic regime and for any Feynman diagram (involving loop and/or phase space integrals), a systematic prescription for explicitly constructing all-logs, all-powers (all-twists) expansions in perfectly factorized form with explicit integrals for coefficients, is presented. The distribution-theoretic nature of the method of asymptotic operation employed allows treatment of totally exclusive phase space in the same manner as loop integrals.

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