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

24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

## 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)

### Building 67 Room 1027

#### Highfield Campus, Universit of Southampton

Talk 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.

### Primary author

Dr Piotr Korcyl (University of Regensburg)

### Co-author

Prof. Gunnar Bali (University of Regensburg)

### Presentation Materials

 Slides
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