Backward Angle (𝒖-Channel) Exclusive and Semi-Inclusive DIS Processes at JLab 12 GeV and Future EIC

The exclusive backward-angle (𝑢-Channel) meson electroproduction from Jefferson Lab electronproton fixed-target scattering experiments in the Deep Inelastic Scattering (DIS) hints at a new domain of applicability ofQCDfactorization in a unique kinematics regime, where the Mandelstam variable 𝑡 -> 𝑡max. The interest in studying nucleon structure through the backward meson production observables has grown significantly. In a recent development, the Semi-Inclusive DIS (SIDIS) process in the 𝑢-Channel kinematics (observables involved the baryon number exchange between the target and ejected particle) was linked to the existence of a baryon junction that was predicted by the local gauge invariance of the baryon wave function. It is suggested that this structure could carry the baryon number. In this presentation, we provide an overview of the upcoming exclusive and the SIDIS measurements, the underlying theory, and the expected results from the JLab 12 Hall C GeV program with future remarks.