Feynman integrals with tensorial structure in the negative dimensional integration scheme
Abstract
The negativedimensional integration method (NDIM) is revealing itself as a very useful technique for computing massless and/or massive Feynman integrals, covariant and noncovariant alike. Up until now, however, the illustrative calculations done using such method have been mostly covariant scalar integrals, without numerator factors. We show here how those integrals with tensorial structures also can be handled straightforwardly and easily. However, contrary to the absence of significant features in the usual approach, here the NDIM also allows us to come across surprising unsuspected bonuses. Toward this end, we present two alternative ways of working out the integrals and illustrate them by taking the easiest Feynman integrals in this category that emerge in the computation of a standard oneloop selfenergy diagram. One of the novel and heretofore unsuspected bonuses is that there are degeneracies in the way one can express the final result for the referred Feynman integral.
 Publication:

European Physical Journal C
 Pub Date:
 September 1999
 DOI:
 10.1007/s100529900074
 arXiv:
 arXiv:hepth/9903076
 Bibcode:
 1999EPJC...10..357S
 Keywords:

 High Energy Physics  Theory
 EPrint:
 9 pages, revtex, no figures