Accessing Generalized Transversity Distributions with Exclusive $π^o$ Electroproduction

Details Accessing Generalized Transversity Distributions with Exclusive $π^o$ Electroproduction Accessing Generalized Transversity Distributions with Exclusive $π^o$ Electroproduction

2009-08-15

arxiv.org/abs/0908.2197v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures, to appear in the proceedings of DIS 2009, 26-30 April 2009, Madrid

Scientific paper

Exclusive $\pi^0$ electroproduction from nucleons at large $Q^2$ can be described by Generalized Parton Distributions (GPDs), particularly the chiral odd subset related to transversity. These GPDs can be accessed experimentally from various cross sections and asymmetries. We calculate these GPDs in a spectator model, constrained by boundary functions. Alternatively, in a hadronic picture the meson production amplitudes correspond to C-odd Regge exchanges with final state interactions. The helicity structure provides relations between the partonic and the hadronic, Regge description of C-odd, chiral-odd processes. Calculations show how the tensor charge and other transversity parameters can be

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