Project description

Semi-inclusive processes form the backbone of much of the physics program at the EIC. They will provide crucial information on fragmentation and the hadronization mechanism and at the same time serve as powerful probes of hadronic structure. They also test key concepts of the theoretical analysis of QCD at high energies, among them factorization, universality, and perturbative calculations. Given the importance of semi-inclusive physics at the EIC, improving the precision of the theoretical description is one of the central tasks for theory.

For the present extension of FOR2926 we have decided to bundle all studies of semi-inclusive physics into one project, our new P4. This project will address a suite of entirely new aspects of SIDIS processes at the EIC. An overall trait of our proposed studies is that they combine high-order precision computations in QCD perturbation theory with phenomenology for the future EIC.

As described earlier, for the present extension we have decided to bundle all studies of semi-inclusive physics into one project, our new P4. This project will address a suite of entirely new aspects of SIDIS processes at the EIC. An overall trait of our proposed studies is that they combine high-order precision computations in QCD perturbation theory with phenomenology for the future EIC. Specifically, we plan to address the following topics:

• SIDIS at high perturbative orders, where the objective is to present new NNLO and threshold- resummed QCD corrections for SIDIS;
• Precision hadronic structure from semi-inclusive reactions, where our goal is to study new types of "more refined" SIDIS observables at the EIC, especially hadron pair production and spin transfer phenomena;<
• Development and application of modern event generators for lepton-hadron colliders. Here we will investigate parton shower effects for EIC DIS and SIDIS observables.