Abstract
We present a first attempt to experimentally extract an effective strong coupling constant that we define to be a low Q2 extension of a previous definition by S. Brodsky et al. following an initial work of G. Grunberg. Using Jefferson Lab data and sum rules, we establish its Q2-behavior over the complete Q2-range. The result is compared to effective coupling constants inferred from different processes and to calculations based on Schwinger–Dyson equations, hadron spectroscopy or lattice QCD. Although the connection between the experimentally extracted effective coupling constants and the calculations is not established it is interesting to note that their behaviors are similar.
Highlights
At experimentally accessible distances, the strong force remains the only interaction that resists satisfactory understanding
We present a first attempt to experimentally extract an effective strong coupling constant that we define to be a low Q2 extension of a previous definition by S
The result is compared to effective coupling constants inferred from different processes and to calculations based on Schwinger-Dyson equations, hadron spectroscopy or lattice Quantum Chromodynamics (QCD)
Summary
The strong force remains the only interaction that resists satisfactory understanding. The result is compared to effective coupling constants inferred from different processes and to calculations based on Schwinger-Dyson equations, hadron spectroscopy or lattice QCD. Recent precision data on moments of nucleon structure functions [1, 2, 3, 4] reveal a smooth transition from small to large scales, while in contrast, a feature of perturbative QCD (pQCD) is that at ΛQCD, the running strong coupling constant αs becomes infinite.
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