$b\bar{b}u\bar{d}$ four-quark systems in the Born-Oppenheimer approximation: prospects and challenges

Abstract

We summarize previous work on $\bar{b}\bar{b}ud$ four-quark systems in the Born-Oppenheimer approximation and discuss first steps towards an extension to the theoretically more challenging $b\bar{b}u\bar{d}$ system. Strategies to identify a possibly existing $b\bar{b}u\bar{d}$ bound state are discussed and first numerical results are presented.

Comments: 8 pages, 4 figures, Proceedings of the 35th International Symposium on Lattice Field Theory, Granada, Spain