The color anti-triplet triquark qqˉqˉ is considered as a compact component in the tetraquark structure cqqˉqˉ of exotic Ds mesons. We discuss the mass spectrum and the flavor mixing of the triquarks by using the instanton induced interaction and the one-gluon exchange potentials. As a characteristic property of the triquark, we investigate the isospin violation. It is shown that the flavor 3ˉ (isosinglet) and 6 (isotriplet) states may be strongly mixed and then are identified with Ds(2632).
@article{arxiv.0704.1345,
title = {Triquark structure and isospin symmetry breaking in exotic Ds mesons},
author = {S. Yasui and M. Oka},
journal= {arXiv preprint arXiv:0704.1345},
year = {2008}
}