Spin Dependence of Diffractive Vector Meson Production

Abstract

I review the recent progress in the theory of s-channel helicity nonconservation (SCHNC) effects in diffractive DIS. SCHNC in diffractive vector meson production is an unique probe of the spin-orbit coupling and Fermi motion of quarks in vector mesons. Photo- and electroproduction of the $\varphi$ and its radial and angular excitations at Jlab is perfectly posed to probe SCHNC in QCD pomeron exchange. I also discuss the unitarity driven demise of the Burkhardt-Cottingham sum rule and large & scaling departure from the Wandzura-Wilczek relation.

Comments: 8 pages, 3 figures. Joint INT / Jefferson Lab Workshop on `Exclusive And Semiexclusive Processes At High Momentum Transfer', JLab, 20-22 May 1999. Several typos corrected, one reference added