Automatic generation of Feynman rules in the Schroedinger functional

Abstract

We provide an algorithm to generate vertices for the Schrödinger 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.

34 pages, 4 figures

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• Computation of the improvement coefficient $c_{sw}$ to 1-loop with improved gluon actions
• Lambda-parameter of lattice QCD with Symanzik improved gluon actions
• Automatic generation of vertices for the Schroedinger functional
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Cited by in corpus (4)

• Automated generation of lattice QCD Feynman rules
• Automated lattice perturbation theory and relativistic heavy quarks in the Columbia formulation
• The Beauty of Lattice Perturbation Theory: The Role of Lattice Perturbation Theory in B Physics
• An O(a) modified lattice set-up of the Schrödinger functional in SU(3) gauge theory