Speaker
Description
Calculations of the QED corrections to semi-inclusive deep-inelastic scattering (SIDIS) are crucial for studies of the 3D structure of the nucleon at JLab and future Electron Ion Collider (EIC). Previously, the important role of two-photon exchange (TPE) was discovered for the studies of nucleon structure in elastic electron-proton scattering. Here, we address the role of TPE corrections on the azimuthal asymmetries of SIDIS. Using the formalism developed in Ref. [2], we evaluate TPE corrections in a soft-photon approximation and demonstrate that the TPE mechanism alone can generate azimuthal asymmetries at a few per cent level that is crucial for interpretation of experimental data on azimuthal moments. In addition, TPE is shown to contribute to the prospective measurements of L/T separation in SIDIS [3]. The predictions are directly related to the anticipated asymmetries of electron/positron scattering cross sections that can be measured with future positron beams at JLab. References [1]. A. Afanasev, P.G. Blunden, D. Hasell, B.A.Raue, Prog. Part. Nucl. Phys. 95, 245 (2017). [2]. A. Afanasev, A. Aleksejevs, S. Barkanova, Phys. Rev. D 88, 053008 (2013). [3]. H. Avakian et al., Jefferson Lab Experiment E12-16-010C. [4]. A. Accardi, A. Afanasev, I. Albayrak, S. Ali, M. Amaryan, J. Annand, J. Arrington, A.Asaturyan, H. Atac, H. Avakian, et al., The European Physical Journal A 57, 261 (2021).
