The gradient flow running coupling in SU2 with 8 flavors

Preprint number: CP3-Origins-2014-38 DNRF90 and DIAS-2014-38
Authors: Tuomas Karavirta (CP3-Origins & DIAS), Viljami Leino (Helsinki Institute of Physics and Department of Physics University of Helsinki), Jarno Rantaharju (Wako, RIKEN and CP3-Origins & DIAS), Teemu Rantalaiho (Helsinki Institute of Physics and Department of Physics University of Helsinki), Kari Rummukainen (Helsinki Institute of Physics and Department of Physics University of Helsinki), and Kimmo Tuominen (Helsinki Institute of Physics and Department of Physics University of Helsinki)
External link: arXiv.org

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We present preliminary results of the gradient flow running coupling with Dirichlet boundary condition in the SU(2) gauge theory with 8 fermion flavours. Improvements to the gradient flow measurement allow us to obtain a robust continuum limit. The results are consistent with perturbative running in the weak coupling region.