Box ladders in a noninteger dimension

Gonzalez, Ivan; Kondrashuk, Igor

doi:10.1007/s11232-013-0120-3

Box ladders in a noninteger dimension

Ivan Gonzalez
(
- Valparaiso U. and
- Santa Maria U., Valparaiso
)
,
Igor Kondrashuk
(
- Biobio U. and
- Bielefeld U.
)

Oct, 2012

25 pages

Published in:

Theor.Math.Phys. 177 (2013) 1515-1539,
Teor.Mat.Fiz. 177 (2013) 1, 276-305

Published: 2013

e-Print:

1210.2243 [hep-th]

DOI:

Report number:

BI-TP-2012-44

View in:

pdf

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Abstract: (arXiv)

We construct a family of triangle-ladder diagrams which may be calculated by making use of Belokurov-Usyukina loop reduction technique in d = 4 -2e dimensions. The main idea of the approach proposed in the present paper consists in generalization of this loop reduction technique existing in d = 4 dimensions. The recursive formula relating the result for L-loop triangle ladder diagram of this family and the result for (L-1)-loop triangle ladder diagram of the same family is derived. Since the method proposed in the present paper combines analytic and dimensional regularizations, at the end of the calculation we have to remove the analytic regularization by taking the double uniform limit in which the parameters of the analytic regularization are vanishing. In this limit on the left hand side of the recursive relations we obtain in the position space the diagram in which the indices of the rungs are 1 and all the other indices are 1-e. Fourier transformation of the diagrams of this type gives the momentum space diagrams which have indices of the rungs equal to 1-e and all the other indices 1. Via conformal transformation of the dual space image of this momentum space representation we relate such a family of the triangle ladder momentum diagrams to a family of the box ladder momentum diagrams in which the indices of the rungs are equal to 1-e and all the other indices are 1. Since any diagram from this family can be reduced to one-loop diagram, the proposed generalization of the Belokurov-Usyukina loop reduction technique to non-integer number of dimensions allows us to calculate this family of box-ladder diagrams in the momentum space explicitly in terms of Appell's hypergeometric function F_4 without expanding in powers of parameter e in an arbitrary kinematic region in the momentum space.

Note:

21 pages, 24 figures, revised version, explicit formulae for off-shell box ladder diagrams are written in d=4-2e dimensions, section 3 is added

Belokurov-Usyukina loop reduction technique
noninteger dimensions
dimension: 4
regularization: dimensional
transformation: conformal
off-shell
infrared problem
loop integral

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