Utilizing lattice QCD results for the potential of two static antiquarks and two dynamical quarks as well as quark model techniques for the dynamics of two heavy antiquarks in a cloud of two light quarks, we are provided with an accurate framework for the study of possibly existing heavy-heavy-light-light tetraquarks. Among the possible quantum numbers of such a system, we find binding in only one channel, the scalar isosinglet. Solving the Schroedinger equation for the displacement of the heavy antiquarks and taking systematic errors into account, we find an antibottom-antibottom-light-light bound state with a confidence level of around 1.8 sigma ... 3.0 sigma and binding energy of approximately 30 MeV ... 57 MeV.
@article{arxiv.1209.6274,
title = {Lattice QCD signal for a bottom-bottom tetraquark},
author = {Pedro Bicudo and Marc Wagner},
journal= {arXiv preprint arXiv:1209.6274},
year = {2013}
}
Comments
7 pages, 3 figures; significantly extended version