The Transverse Spin

Abstract

Contents : 1. Pre-history 2. Transversity versus helicity 3. The massless limit. "Cardan" and "see-saw" transformations 4. Transversity distribution delta q(x). The diquark spectator model 5. Soffer inequality 6. Tensor charge sum rule 7. t-channel analysis 8. Selection rules for delta q(x) measurements 9. Evolution with Q squared 10. Quark polarimetry. The sheared-jet (Collins) effect 11. Single-spin asymmetries in inclusive experiments 12. Quark distribution dependent on both spin and transverse momentum 13. First evidence of quark transversity

Figures (7)

• Figure 1: Unitarity diagram representing $\delta q(x)$, according to (\ref{['interf']}).
• Figure 2: Unitarity diagram showing the impossibility to measure $\delta q(x)$ in deep inelastic lepton scattering.
• Figure 3: Diagram of the Drell-Yan reaction (\ref{['D-Y']}).
• Figure 4: Evolution of $\delta q(x,Q^2)$.
• Figure 5: Diagram showing the impossibility to couple $\delta q(x)$ to gluons.