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Accessing Generalized Transversity Distributions with Exclusive π^o Electroproduction

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arxiv 0908.2197 v1 pith:H7IIH4YI submitted 2009-08-15 hep-ph

Accessing Generalized Transversity Distributions with Exclusive π^o Electroproduction

classification hep-ph
keywords gpdstransversityc-odddistributionselectroproductionexclusivegeneralizedhadronic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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