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Schrödinger functional at N_f=-2
Bernd Gehrmann, Stefan Kurth, Juri Rolf +1
We study the Schrödinger functional coupling for lattice Yang-Mills theory coupled to an improved bosonic spinor field, which corresponds to QCD with minus two light flavors. This…
Nonstandard Cutoff Effects in the Nonlinear Sigma Model
Martin Hasenbusch, Peter Hasenfratz, Ferenc Niedermayer +2
High precision measurements of the renormalized zero-momentum 4-point coupling g_R and of the Luscher-Weisz-Wolff running coupling gbar(L) = L*m(L) performed with two different lat…
The Schroedinger functional coupling in quenched QCD at low energies
Jochen Heitger, Hubert Simma, Rainer Sommer +1
Existing non-perturbative computations of the running coupling of quenched QCD in the Schroedinger functional scheme are extended to scales mu lying much deeper in the low-energy r…
Schr"odinger functional at negative flavour number
Bernd Gehrmann, Juri Rolf, Stefan Kurth +1
The scaling of the Schr"odinger functional coupling is studied numerically and perturbatively for an SU(3) lattice gauge field coupled to an O(a) improved bosonic spinor field. Thi…
First results on the running coupling in QCD with two massless flavours
Achim Bode, Roberto Frezzotti, Bernd Gehrmann +11
We report on the non-perturbative computation of the running coupling of two-flavour QCD in the Schr"odinger functional scheme. The corresponding Lambda-parameter, which describes…