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A multidimensional extraction of the structure function ratio$\sigma_{LT'}/\sigma_{0}$ from the hard exclusive $\vec{e} p \to e^\prime n\pi^+$ reaction above the resonance region has been performed. The study wasdone based on beam-spin asymmetry measurements using a 10.6 GeV incidentelectron beam on a liquid-hydrogen target and the CLAS12 spectrometer atJefferson Lab. The measurements focus on the very forward regime ($t/Q^{2}$$\ll$ 1) with a wide kinematic range of $x_{B}$ in the valence regime (0.17 $<$$x_{B}$ $<$ 0.55), and virtualities $Q^{2}$ ranging from 1.5 GeV$^{2}$ up to 6GeV$^{2}$. The results and their comparison to theoretical models based onGeneralized Parton Distributions demonstrate the sensitivity to chiral-odd GPDsand the directly related tensor charge of the nucleon. In addition, the data iscompared to an extension of a Regge formalism at high photon virtualities. Itwas found that the Regge model provides a better description at low $Q^{2}$,while the GPD model is more appropriate at high $Q^{2}$.

physics letters b

A multidimensional study of the structure function ratio  $\sigma_{LT'}/\sigma_{0}$ from hard exclusive $\pi^+$ electro-production off  protons in the GPD regime