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We calculate timelike virtual Compton scattering amplitudes in thegeneralized Bjorken scaling regime and focus on a new polarization asymmetry inthe scattering process with a linearly polarized photon beam in the mediumenergy range, which will be studied intensely at JLab12 experiments. Wedemonstrate that new observables help us to access the polarized quark andgluon generalized parton distributions $\tilde H(x, \xi, t)$ and $ \tilde E(x,\xi, t)$.

Timelike deeply virtual Compton scattering with a linearly polarized real (or quasi-real) photon beam