Puzzles and challenges in heavy-quarkonium theory

Giorno 19 ottobre 2023, con inizio alle ore 15:00, presso l'Aula F del DFA, su invito del Prof. Vincenzo Branchina, il Prof. Bernd Kniehl (Univ. Hamburg) terrà un seminario dal titolo Puzzles and challenges in heavy-quarkonium theory.

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Abstract. I discuss some problems in heavy-quarkonium physics, mainly focusing on improvements from QCD. The factorization formalism of non-relativistic QCD (NRQCD) provides a rigorous theoretical framework for the description of heavy-quarkonium production and decay. This involves NRQCD long-distance matrix elements, which are predicted to be universal. The verification of NRQCD factorization by comparison of its predictions with heavy-quarkonium data has turned out to be a long and winding road. The state of the art is reviewed and an outlook is presented.