Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1994-10-19
Nucl.Phys. B437 (1995) 163-186
Physics
High Energy Physics
High Energy Physics - Theory
22 pages, LaTeX style, University of Parma preprint UPRF 94-412
Scientific paper
10.1016/0550-3213(94)00569-Z
In the exact renormalization group (RG) flow in the infrared cutoff $\Lambda$ one needs boundary conditions. In a previous paper on $SU(2)$ Yang-Mills theory we proposed to use the nine physical relevant couplings of the effective action as boundary conditions at the physical point $\Lambda=0$ (these couplings are defined at some non-vanishing subtraction point $\mu \ne 0$). In this paper we show perturbatively that it is possible to appropriately fix these couplings in such a way that the full set of Slavnov-Taylor (ST) identities are satisfied. Three couplings are given by the vector and ghost wave function normalization and the three vector coupling at the subtraction point; three of the remaining six are vanishing (\eg the vector mass) and the others are expressed by irrelevant vertices evaluated at the subtraction point. We follow the method used by Becchi to prove ST identities in the RG framework. There the boundary conditions are given at a non-physical point $\Lambda=\Lambda' \ne 0$, so that one avoids the need of a non-vanishing subtraction point.
Bonini Marco
D'Attanasio Marco
Marchesini Giuseppe
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