An analytic Pade-motivated QCD coupling

Details An analytic Pade-motivated QCD coupling An analytic Pade-motivated QCD coupling

2010-02-05

arxiv.org/abs/1002.1264v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

2 pages, 1 figure (double), to appear in the Proceedings of the VIII Latin American Symposium on Nuclear Physics and Applicati

Scientific paper

We consider a modification of the Minimal Analytic (MA) coupling of Shirkov and Solovtsov. This modified MA (mMA) coupling reflects the desired analytic properties of the space-like observables. We show that an approximation by Dirac deltas of its discontinuity function $\rho$ is equivalent to a Pad\'e (rational) approximation of the mMA coupling that keeps its analytic structure. We propose a modification to mMA that, as preliminary results indicate, could be an improvement in the evaluation of low-energy observables compared with other analytic couplings.

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