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Proposing Institution

Universität Regensburg,Fakultät für Physik
Project Manager

Prof. Dr. Andreas Schäfer
92040 Regensburg
This project is part of a major German-US lattice effort to investigate the properties of TransverseMomentum Dependent parton distribution functions (TMDs). The experimental investigation of TMDs is one of the main physics goals of the projected new US accelerator EIC (Electron Ion Collider) the construction of which is pursued jointly by the Brookhaven National Laboratory (BNL) and the Thomas Jefferson National Accelerator Facility. The emphasis on TMDs is motivated by the fact that they link experimental observables to the detailed properties of QCD gauge links and thus to the most characteristic features of QCD. The physics of TMDs is still only partly understood. The open problem which is phenomenologically most relevant is the scale dependence which, in contrast to the case of normal parton distribution functions, has unsuppressed non-perturbative contributions. The aim of the present project is, therefore, to study the scaling of TMDs on the lattice. To do so we want to use the large number of ensembles which were generated by the CLS collaboration, precisely with the aim to study the dependence on the lattice constant a. For these ensembles, open boundary conditions were used, which avoid the problem of diverging topological autocorrelation times for small a. Settling the non-perturbative scaling properties of TMDs would mark a major advance in our understanding of hadron structure.

Impressum, Conny Wendler