38 research outputs found
IR finite one-loop box scalar integral with massless internal lines
The IR finite one-loop box scalar integral with massless internal lines has
been recalculated. The result is very compact, simple and valid for arbitrary
values of the relevant kinematic variables. It is given in terms of only two
dilogarithms and a few logarithms, all of very simple arguments.Comment: 7 pages, 2 figure
Dimensionally regulated one-loop box scalar integrals with massless internal lines
Using the Feynman parameter method, we have calculated in an elegant manner a
set of oneloop box scalar integrals with massless internal lines, but
containing 0, 1, 2, or 3 external massive lines. To treat IR divergences (both
soft and collinear), the dimensional regularization method has been employed.
The results for these integrals, which appear in the process of evaluating
oneloop point integrals and in subdiagrams in QCD loop
calculations, have been obtained for arbitrary values of the relevant kinematic
variables and presented in a simple and compact form.Comment: 14 pages, 2 figures included, SVJour, journal versio