Direct Extraction Of One Loop Rational Terms

Details Direct Extraction Of One Loop Rational Terms Direct Extraction Of One Loop Rational Terms

2008-06-27

arxiv.org/abs/0806.4600v2

JHEP 0901:049,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

35 pages, 6 figures. Major revisions: new analytic results for gluon amplitudes and new section on treatment of massless fermi

Scientific paper

10.1088/1126-6708/2009/01/049

We present a method for the direct extraction of rational contributions to one-loop scattering amplitudes, missed by standard four-dimensional unitarity techniques. We use generalised unitarity in $D=4-2\e$ dimensions to write the loop amplitudes in terms of products of massive tree amplitudes. We find that the rational terms in $4-2\e$ dimensions can be determined from quadruple, triple and double cuts without the need for independent pentagon contributions using a massive integral basis. The additional mass-dependent integral coefficients may then be extracted from the large mass limit which can be performed analytically or numerically. We check the method by computing the rational parts of all gluon helicity amplitudes with up to six external legs. We also present a simple application to amplitudes with external massless fermions.

Affiliated with

Also associated with

No associations

Rating

Direct Extraction Of One Loop Rational Terms does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Direct Extraction Of One Loop Rational Terms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct Extraction Of One Loop Rational Terms will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-693270