Progress and challenges in hadron structure calculations on the lattice
Dr. Philipp G. Hägler (TU München)

The recent years have seen substantial progress in the understanding of the quark and gluon structure of hadrons, which is to a large extent based on hadron form factors, (generalized) parton distributions, and transverse momentum dependent distributions. These observables provide important insights into a number of fundamental physics questions related to, e.g., the distribution of charge and momentum in hadrons, their spin structure in terms of spins and orbital angular momenta of quarks and gluons, and correlations between spin, momentum and coordinate degrees of freedom inside hadrons. Lattice quantum chromodynamics provides a means to address these questions starting from first principles. Following a brief introduction into the basic concepts and methods, this talk will focus on selected results from dynamical lattice QCD simulations on hadron structure, including a discussion of the proton spin sum rule. Remaining challenges and future perspectives will be highlighted at the end of the talk.