Speaker
Description
In recent years, a lot of evidence has been gathered for exponential clover Wilson fermions suggesting that cutoff effects are reduced compared to standard clover improved Wilson fermions. The exponential clover implementation gives rise to new vertices in perturbation theory, which need to be incorporated in perturbative calculations of, e.g., improvement coefficients. Here, we study possible contributions to the critical mass and $c_\mathrm{A}$, the improvement coefficient of the non-singlet axial-vector current, to one-loop order. For our calculations, we exploit the Schrödinger functional finite-volume renormalisation scheme at vanishing quark mass, with subsequent continuum extrapolations to estimate associated cutoff effects. Our numerical calculations with both plaquette and tree-level Symanzik-improved gauge action show that the critical mass receives additional contributions at one-loop order, while $c_\mathrm{A}$ is free of such contributions.