Hard exclusive π⁺ electro production off the proton in the GPD regime with CLAS12

Hard exclusive meson production is a well established tool to study the 3D nucleon structure in terms of the transverse position and the longitudinal momentum component of the partons. The QCD factorisation mechanism in the "nearly forward region" (t/Q² small) can be divided into a hard part, described by perturbative QCD (pQCD) and in two general structure functions, the GPDs for the nucleon and the pion distribution amplitudes (DAs), describing the complex non perturbative structure of these particles. The talk presents a measurement of single beam spin asymmetries to extract the polarized cross section ratio σ_LT’/σ₀ from the hard exclusive π⁺ channel off the unpolarized hydrogen based on data taken with the CLAS12 spectrometer in hall B at Jefferson Lab. A detailed multidimensional study will be presented and discussed based on a comparison to theoretical models.