Running of the SF-coupling with four massless flavours

Rainer Sommer; Fatih Tekin; Ulli Wolff

Running of the SF-coupling with four massless flavours

High Energy Physics - Lattice 2011-05-13 v1

Authors: Rainer Sommer , Fatih Tekin , Ulli Wolff

Abstract

We discuss the status of different determinations of alpha_s, motivating a precise and reliable computation from lattice QCD. In order to suppress perturbative errors, the non-perturbative computation has to reach high energy scales mu. Such results already exist in the SF-scheme for N_f=0,2 and N_f=3. We recently added the running with four massless flavours in a range of alpha from about 0.07 to 0.3 . It is based on our recent determination of the Sheikholeslami Wohlert coefficient in the four-flavour theory.

Keywords

running coupling Schrödinger functional lattice QCD massless flavours alpha_s Sheikholeslami-Wohlert coefficient

Cite

@article{arxiv.1011.2332,
  title  = {Running of the SF-coupling with four massless flavours},
  author = {Rainer Sommer and Fatih Tekin and Ulli Wolff},
  journal= {arXiv preprint arXiv:1011.2332},
  year   = {2011}
}

Comments

7 pages, Lattice 2010 proceedings

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