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Physical Review D

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Triquark structure and isospin symmetry breaking in exotic $D_{s}$ mesons

S. Yasui and M. Oka

Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan

Phys. Rev. D 76, 034009 – Published 15 August, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.034009

Abstract

The color antitriplet triquark $q \bar{q} \bar{q}$ is considered as a compact component in the tetraquark structure $c q \bar{q} \bar{q}$ of exotic $D_{s}$ 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 $\bar{3}$ (isosinglet) and $6$ (isotriplet) states may be strongly mixed and then are identified with $D_{s} (2632)$ .

Article Text

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