A New Method of Calculating the Running Coupling Constant

Details A New Method of Calculating the Running Coupling Constant A New Method of Calculating the Running Coupling Constant

2008-08-21

arxiv.org/abs/0808.2875v2

PoS LATTICE2008:247,2008

Physics

High Energy Physics

High Energy Physics - Lattice

13 pages, 6 figures, based on talks given by E. Itou and M. Kurachi at The XXVI International Symposium on Lattice Field Theor

Scientific paper

We propose a new method to compute the running coupling constant of gauge theories on the lattice. We first give the definition of the running coupling in the new scheme using the Wilson loops in a finite volume, and explain how the running of the coupling constant is extracted from the measurement of the volume dependence. The perturbative calculation of the renormalization constant to define the scheme is also given at the leading order. As a benchmark test of the new scheme we apply the method the case of the quenched QCD. We show the preliminary result from our numerical simulations which are carried out with plaquette gauge action for various lattice sizes and bare lattice couplings. With techniques to improve the statistical accuracy, we show that we can determine the non-perturbative running of the coupling constant in a wide range of the energy scale with relatively small number of gauge configurations in our scheme. We compare our lattice data of the running coupling constant with perturbative renormalization group evolution at one- and two-loop order, and confirm the consistency between them at high energy.

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