How the X(5568) challenges our understanding of QCD
High Energy Physics - Phenomenology
2016-08-03 v2 High Energy Physics - Experiment
Nuclear Theory
Abstract
We discuss the X(5568) particle recently announced by the D0 Collaboration. Several types of models were proposed to explain this structure in the literature. As pointed out by Burns and Swanson (arXiv:1603.04366), none of them provides a satisfactory description of the observation. We provide additional arguments using general properties of QCD, and conclude that the observation of the X(5568), if confirmed, poses serious challenges to our understanding of nonperturbative QCD.
Cite
@article{arxiv.1603.06316,
title = {How the X(5568) challenges our understanding of QCD},
author = {Feng-Kun Guo and Ulf-G. Meißner and Bing-Song Zou},
journal= {arXiv preprint arXiv:1603.06316},
year = {2016}
}
Comments
5 pages. Typos removed, a wrong statement corrected, conclusions unchanged; the LHCb preliminary result mentioned at the end