Study of spin sum rules (and the strong coupling constant at large distances)

Abstract

We present recent results from Jefferson Lab on sum rules related to the spin structure of the nucleon. We then discuss how the Bjorken sum rule, with its connection to the Gerasimov-Drell-Hearn sum, allows us to conveniently define an effective coupling for the strong force at all distances.

Contribution to the proceeding of the workshop on the Physics of Excited Nucleon (NSTAR2009, Beijing April 2009). To be published in Chinese Physics C, Vol 33 (2009)

References in corpus (8)

• Linear Confinement and AdS/QCD
• Hadronic Spectra and Light-Front Wavefunctions in Holographic QCD
• Precise determination of the spin structure function ${\mathbf{g}}_1$ of the proton, deuteron and neutron
• Measurement of the $x$- and $Q^2$-Dependence of the Asymmetry $A_1$ on the Nucleon
• Maximum Wavelength of Confined Quarks and Gluons and Properties of Quantum Chromodynamics
• Determination of the effective strong coupling constant alpha_{s,g_1}(Q^2) from CLAS spin structure function data
• Experimental study of isovector spin sum rules
• Moments of the Spin Structure Functions g_1^p and g_1^d for 0.05 < Q^2 < 3.0 GeV^2