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We investigate the possibility to acquire information on the generalized parton distribution E and, through a model for E, also on the u-quark total angular momentum J_u by studying deeply virtual Compton scattering and hard exclusive rho0 electroproduction on a transversely polarized hydrogen target at HERMES. It is found that a change in J_u from zero to 0.4 corresponds to a 4\sigma (2\sigma) difference in the calculated transverse target-spin asymmetry in deeply virtual Compton scatteringdoi:10.1140/epjc/s2006-02529-3 fatcat:rivrficobjginfdnjt3lmu4ncq