We discuss our present knowledge of α s, the fundamental running coupling or effective
charge of Quantum Chromodynamics (QCD). A precise understanding of the running of α s …

This article reviews our present understanding of QCD spin physics: the proton spin puzzle
and new developments aimed at understanding the transverse structure of the nucleon …

I introduce a gauge-invariant decomposition of the nucleon spin into quark helicity, quark
orbital, and gluon contributions. The total quark (and hence the quark orbital) contribution is …

One of the triumphs of modern particle physics has been the extent to which Quantum
Chromodynamics (QCD) has successfully accounted for the strong interaction processes …

Abstract We review the Nambu-Jona-Lasinio (NJL) approach to the dynamical breaking of
chiral symmetry in Quantum Chromodynamics (QCD). After a general overview of the …

We study in QCD the physics of deeply virtual Compton scattering (DVCS)—the virtual
Compton process in the large s and small t kinematic region. We show that DVCS can probe …

The strong coupling constant: state of the art and the decade ahead - IOPscience Skip to
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Measurements are reported of the proton and deuteron spin structure functions g 1 p and g 1
d at beam energies of 29.1, 16.2, and 9.7 GeV, and g 2 p and g 2 d at a beam energy of 29.1 …

We present the final results of the spin asymmetries A 1 and the spin structure functions g 1
of the proton and the deuteron in the kinematic range 0.0008< x< 0.7 and 0.2< Q 2< 100 …

We present a measurement of the deuteron spin-dependent structure function g1d based on
the data collected by the COMPASS experiment at CERN during the years 2002–2004. The …