Automatic generation of Feynman rules in the Schroedinger functional

Details Automatic generation of Feynman rules in the Schroedinger functional Automatic generation of Feynman rules in the Schroedinger functional

2008-08-22

arxiv.org/abs/0808.3065v1

Nucl.Phys.B811:36-65,2009

Physics

High Energy Physics

High Energy Physics - Lattice

34 pages, 4 figures

Scientific paper

10.1016/j.nuclphysb.2008.11.022

We provide an algorithm to generate vertices for the Schr\"odinger functional with an abelian background gauge field. The background field has a non-trivial color structure, therefore we mainly focus on a manipulation of the color matrix part. We propose how to implement the algorithm especially in python code. By using python outputs produced by the code, we also show how to write a numerical expression of vertices in the time-momentum as well as the coordinate space into a Feynman diagram calculation code. As examples of the applications of the algorithm, we provide some one-loop results, ratios of the Lambda parameters between the plaquette gauge action and the improved gauge actions composed from six-link loops (rectangular, chair and parallelogram), the determination of the O(a) boundary counter term to this order, and the perturbative cutoff effects of the step scaling function of the Schroedinger functional coupling constant.

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