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Spin and transverse momentum dependent parton distributions - GeneralizedParton Distributions (GPDs) - are at the interface between the QCD structure ofthe hadrons and observable quantities. The GPDs are linear superpositionswithin helicity amplitudes. The amplitudes are probed in high energyleptoproduction processes through angular dependent cross sections andpolarization asymmetries. Phenomenological extraction of the amplitudes and thedistributions is a challenging task. We present observables that connectparticularly with the chiral odd quark-nucleon helicity amplitudes for DeeplyVirtual $\pi^0$ Production.

Probing Spin Dependent Parton Distributions though Deeply Virtual Processes