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arXiv · hep-ph/0305025

Implications of a DK Molecule at 2.32 GeV

T. Barnes·F. E. Close·H. J. Lipkin
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Abstract

We discuss the implications of a possible quasinuclear DK bound state at 2.32 GeV. Evidence for such a state was recently reported in D_s^+pi^o by the BaBar Collaboration. We first note that a conventional quark model c-sbar assignment is implausible, and then consider other options involving multiquark systems. An I=0 c sbar n nbar baryonium assignment is one possibility. We instead favor a DK meson molecule assignment, which can account for the mass and quantum numbers of this state. The higher-mass scalar c-sbar state expected at 2.48 GeV is predicted to have a very large DK coupling, which would encourage formation of an I=0 DK molecule. Isospin mixing is expected in hadron molecules, and a dominantly I=0 DK state with some I=1 admixture could explain both the narrow total width of the 2.32 GeV state as well as the observed decay to D_s^+ pi^o. Additional measurements that can be used to test this and related scenarios are discussed.

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T. Barnes, F. E. Close, H. J. Lipkin. 2003-05-02. Implications of a DK Molecule at 2.32 GeV. https://doi.org/10.1103/physrevd.68.054006

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