Infrared divergences and a non-local gauge for superspace Yang-Mills theory |
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Authors: | LF Abbott MT Grisaru D Zanon |
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Institution: | Physics Department, Brandeis University, Waltham, MA 02254, USA;Lyman Laboratory of Physics, Harvard University, Cambridge, MA 02138, USA |
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Abstract: | The usual superspace approach to supersymmetric gauge theories suffers from problems with infrared divergences which greatly complicate multiloop calculations. We eliminate these divergences by introducing a non-local gauge-fixing term. In the background field method this term leads to unusual quantum-background interactions. Functional methods are presented for dealing with these interactions. As an example we compute the two-loop Yang-Mills β-function using the background field method in superspace. We also show how a non-local gauge can be used in ordinary, non-supersymmetric Yang-Mills theory. |
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