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The two loop crossed ladder vertex diagram with two massive exchanges


Aglietti, U; Bonciani, R; Grassi, L; Remiddi, E (2008). The two loop crossed ladder vertex diagram with two massive exchanges. Nuclear Physics, Section B, 789(1-2):45-83.

Abstract

We compute the (three) master integrals for the crossed ladder diagram with two exchanged quanta of equal mass. The differential equations obeyed by the master integrals are used to generate power series expansions centered around all the singular (plus some regular) points, which are then matched numerically with high accuracy. The expansions allow a fast and precise numerical calculation of the three master integrals (better than 15 digits with less than 30 terms in the whole real axis). A conspicuous relation with the equal-mass sunrise in two dimensions is found. Comparison with a previous large momentum expansion is made finding complete agreement.

We compute the (three) master integrals for the crossed ladder diagram with two exchanged quanta of equal mass. The differential equations obeyed by the master integrals are used to generate power series expansions centered around all the singular (plus some regular) points, which are then matched numerically with high accuracy. The expansions allow a fast and precise numerical calculation of the three master integrals (better than 15 digits with less than 30 terms in the whole real axis). A conspicuous relation with the equal-mass sunrise in two dimensions is found. Comparison with a previous large momentum expansion is made finding complete agreement.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Feynman diagrams; Multi-loop calculations
Language:English
Date:January 2008
Deposited On:13 Feb 2009 15:14
Last Modified:05 Apr 2016 13:00
Publisher:Elsevier
ISSN:0550-3213
Publisher DOI:10.1016/j.nuclphysb.2007.07.019
Related URLs:http://arxiv.org/abs/0705.2616
Permanent URL: http://doi.org/10.5167/uzh-13583

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