NSPT estimate of the improvement coefficient cA to two loops
Abstract
By using Numerical Stochastic Perturbation Theory (NSPT), we carry out a quenched two-loop computation of the improvement coefficient cA associated to the isovector axial current. Within the Schr\"odinger Functional formalism, we compute the bare quark mass m and fix cA by requiring discretization corrections on m to be of order O(a2) in the lattice spacing a.
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