Possibility of Narrow High-Mass Exotic States

Details Possibility of Narrow High-Mass Exotic States Possibility of Narrow High-Mass Exotic States

2007-10-22

arxiv.org/abs/0710.4055v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 7 pages, 2 figures

Scientific paper

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.

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