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.
@article{arxiv.1807.11616,
title = {NSPT estimate of the improvement coefficient $c_A$ to two loops},
author = {Christian Torrero},
journal= {arXiv preprint arXiv:1807.11616},
year = {2019}
}