The 34th International Symposium on Lattice Field Theory (Lattice 2016)

Non-perturbative determination of improvement coefficients using coordinate space correlators in Nf=2+1 lattice QCD

27 Jul 2016, 10:00

20m

Building 67 Room 1027 (Highfield Campus, Universit of Southampton)

Talk Standard Model Parameters and Renormalization Standard Model Parameters and Renormalization

Speaker

Dr Piotr Korcyl (University of Regensburg)

Description

We determine quark mass dependent order a improvement terms of the form $b_J$ am for non-singlet scalar, pseudoscalar, vector and axialvector currents, using correlators in coordinate space. We use a set of CLS ensembles comprising non-perturbatively improved Wilson Fermions and the tree-level Luescher-Weisz gauge action at $\beta=3.4, 3.46, 3.55$ and $\beta=3.7$, corresponding to lattice spacings a in [0.05,0.09] fm. We report the values of the $b_J$ improvement coefficients which are proportional to non-singlet quark mass combinations and also discuss the possibility of determining the $\bar{b}_J$ coefficients which are proportional to the trace of the quark mass matrix.

Presentation materials

Slides

lattice2016.pdf