2025/10/31 by Pire, Bernard, Semenov-Tian-Shansky, Kirill, Sznajder, Paweł +1
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.2510.27425
To study cross sections and polarization asymmetries for the processes e p → e n π+ and e p → e p π0 in the backward region, we develop a flexible phenomenological model for nucleon-to-pion transition distribution amplitudes (πN TDAs), which are used in the QCD collinear factorization description of the scattering amplitudes. Our model is based on the two-component factorized Ansatz for the corresponding spectral densities, quadruple distribution. It takes into account the constraints for πN TDAs arising from the threshold pion production theorem and also includes a forward limit contribution that can be fitted to experimental data. We examine the sensitivity of observable predictions to various modelling assumptions.