Running of the SF-coupling with four massless flavours

Details Running of the SF-coupling with four massless flavours Running of the SF-coupling with four massless flavours

2010-11-10

arxiv.org/abs/1011.2332v1

PoS Lattice2010:241,2010

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, Lattice 2010 proceedings

Scientific paper

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.

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