Deeply pseudoscalar meson production and Generalized Transversity Distributions
A longstanding goal in nuclear and particle physics has been to describe the three dimensional structure of the nucleon in terms of the quarks and gluon fields. Exclusive electron scattering at high momentum transfers Q^2 directly related to the Generalized Parton Distributions (GPDs). Most reactions studied, such as DVCS or vector meson electroproduction, are primarily sensitive to the chiral-even GPDs. Very little is known about the chiral-odd GPDs, except that H_T becomes the transversity function h_1 in the forward limit. It turns out that pseudoscalar meson electroproduction, and especially pi^0 and eta production, were identified as especially sensitive to the parton helicity-flip subprocesses. Dedicated experiments to study Deeply Virtual Meson Production have been carried out in Hall B at Jefferson Lab. The cross sections and asymmetries of the exclusive pseudoscalar meson electroproduction processes in a very wide kinematic range of Q^2, x_B and t have been measured with CLAS. The Generalized form factors H^pi,eta_T and E-bar^pi,eta_T were extracted directly form the experimental observables. These combined pi^0 and eta data will provide the way for the flavor decomposition of the transversity GPDs.