Published March 1, 2004 | Version v1
Journal article

Numerical evaluation of multi-loop integrals by sector decomposition

Description

In a recent paper [Nucl. Phys. B 585 (2000) 741] we have presented an automated subtraction method for divergent multi-loop/leg integrals in dimensional regularisation which allows for their numerical evaluation, and applied it to diagrams with massless internal lines. Here we show how to extend this algorithm to Feynman diagrams with massive propagators and arbitrary propagator powers. As applications, we present numerical results for the master 2-loop 4-point topologies with massive internal lines occurring in Bhabha scattering at two loops, and for the master integrals of planar and non-planar massless double box graphs with two off-shell legs. We also evaluate numerically some two-point functions up to 5 loops relevant for beta-function calculations, and a 3-loop 4-point function, the massless on-shell planar triple box. Whereas the 4-point functions are evaluated in non-physical kinematic regions, the results for the propagator functions are valid for arbitrary kinematics

Additional details

Identifiers

DOI
10.1016/j.nuclphysb.2003.12.023;
arXiv
arXiv:hep-ph/0305234v1;
PII
S0550321303010800;

Publishing Information

Journal Title
Nuclear Physics. B
Journal Volume
680
Journal Issue
1-3
Journal Page Range
p. 375-388
ISSN
0550-3213
CODEN
NUPBBO

INIS

Country of Publication
Netherlands
Country of Input or Organization
Cuba
INIS RN
35077828
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
BHABHA SCATTERING; FEYNMAN DIAGRAM; INTEGRALS; MASSLESS PARTICLES; NUMERICAL ANALYSIS; PROPAGATOR
Descriptors DEC
DIAGRAMS; ELASTIC SCATTERING; ELEMENTARY PARTICLES; INFORMATION; MATHEMATICS; SCATTERING

Optional Information

Copyright
Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.