Possibility of Narrow High-Mass Exotic States

Abstract

Narrow high-mass states can arise despite large phase space when two nearly degenerate states are coupled to the same dominant decay mode. Mixing via a final-state interaction loop diagram can produce one very broad state and one narrow state. Such a situation is generic in exotic hadrons where a color singlet with given flavor and spin quantum numbers can be constructed with two distinct internal color couplings of quarks. The simplest realization of this idea are the (Q Qbar q qbar) tetraquarks containing two heavy and two light quarks. We discuss possible experimental implications, including recent data from Belle.

LaTeX, 7 pages, 2 figures

References in corpus (1)

• Observation of a resonance-like structure in the pi^+- psi' mass distribution in exclusive B-->K pi^+- psi' decays

Cited by in corpus (3)

• Configuration mixing in strange tetraquarks $Z_{cs}$
• Heavy quark spectroscopy and prediction of bottom baryon masses
• Exotic c c-bar Mesons