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Program: q2e, exp
Keywords: Asymptotic expansion, large momenta, hard masses, automated calculations
Authors: R. Harlander, T. Seidensticker, M. Steinhauser
Short description: Asymptotic expansions constitute an important tool for the evaluation of Feynman diagrams in particle physics. The combination of the programs q2e and exp perform the asymptotic expansion at the symbolic level in an automated way.

q2e: re-write Qgraf output in FORM notation.

exp: use the output of q2e, apply the asymptotic expansion and generate FORM code for each subdiagram.

(PDF description)



q2e and exp have been used in a variety of phenomenological problems. The first application was the computation of top quark mass suppressed terms to the decay of Z boson to bottom quarks to order ααs.


q2e and exp are available from the authors.

Conditions of use

We ask you to refer to

R. Harlander, T. Seidensticker and M. Steinhauser, arXiv:hep-ph/9712228.
T.~Seidensticker,  arXiv:hep-ph/9905298.

if you use q2e/exp in scientific publications.


Available from the authors.