Decays of X(3872) and its partners as hidden-charm axial-vector tetra-quark mesons are studied. As the result, it is seen that the iso-triplet partners of X(3872) can be broad, and therefore, higher statistics would be needed to find them.
@article{arxiv.1107.5868,
title = {X(3872) and Its Iso-Triplet Partners},
author = {Kunihiko Terasaki},
journal= {arXiv preprint arXiv:1107.5868},
year = {2012}
}