ar X iv : h ep - p h / 96 12 35 2 v 3 1 8 D ec 1 99 6 SPIN STRUCTURE OF THE NUCLEON

ar X iv : h ep - p h / 98 12 53 7 v 1 3 1 D ec 1 99 8 Explorations of Compositeness 1

Some of the motivations for quark and lepton compositeness, and some problems associated with present schemes, are noted. One model is discussed in which quarks and leptons are taken as composites of spin-1/2 fermions F with charges ±1/2 and spinless bosons S̄ with charges 1/6 and −1/2.

ar X iv : h ep - p h / 96 03 24 9 v 1 8 M ar 1 99 6 GAUGE - INVARIANT DECOMPOSITION OF NUCLEON SPIN AND ITS SPIN - OFF ∗

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 shown to be measurable through virtual Compton scattering in a special kinematic region where single quark scattering dominates. This deeply-virtual Compton scattering (DVCS) has much potential to unravel the q...

X iv : h ep - p h / 97 12 45 8 v 1 1 9 D ec 1 99 7 Review on the Status of Spin Structure Function Measurements

Results are presented on inclusive measurements of the spin structure function g 1 (x). The world's data on spin–dependent deep inelastic scattering are summarized. Results from recent Next–to–Leading Order (NLO) QCD analyses are given. They provide another successful test of QCD. The uncertainties arising from the low–x extrapolation of the inclusive data in absence of any measurement prevent ...

ar X iv : h ep - p h / 99 12 28 8 v 2 1 5 D ec 1 99 9 Lattice Calculations and Hadron Physics

ar X iv : h ep - p h / 96 04 26 9 v 1 9 A pr 1 99 6 About the Q 2 dependence of asymmetry A 1

We analyse the proton and deutron data on spin dependent asymmetry A 1 (x, Q 2) supposing the DIS structure functions g 1 (x, Q 2) and F 3 (x, Q 2) have the similar Q 2-dependence. As a result, we have obtained Γ p