%0 Journal Article
%T Possibility of Narrow High-Mass Exotic States
%A Karliner
%A Marek
%A Lipkin
%A Harry J.
%J High Energy Physics - Phenomenology
%D 2007
%I 
%X 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.
%U http://arxiv.org/abs/0710.4055