Implications of a DK molecule at 2.32-GeV

May, 2003
6 pages
Published in:
  • Phys.Rev.D 68 (2003) 054006
e-Print:

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Abstract: (arXiv)
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.
Note:
  • 6 pages, 1 figure
  • 14.40.Ev
  • 14.40.Lb
  • 14.40.Nd
  • D/s(2317)
  • bound state: (D+ K0)
  • K anti-K: molecule
  • quark antiquark: bound state
  • quark: charm
  • antiquark: strangeness
  • isospin: interference