Constituent Counting Rules and Exotic Hadrons

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Abstract

The constituent counting rules, i.e., the scaling behavior of amplitudes (in terms of the number of fundamental constituents) for exclusive processes when high energy scales are present, have been known for decades, and have been borne out in a number of experiments. Such scaling would be sensitive, in particular, to possible exotic multiquark content. Here we examine how one may use the rules to test for pentaquarks in electroproduction, or for tetraquarks in e+e- annihilation. An interesting new type of scaling (separate Mandelstam s and t behavior) arises in the forward scattering direction. The correct scaling arises naturally in AdS/QCD, in which the amplitudes can be computed explicitly.

Original languageEnglish (US)
Article number106
JournalFew-Body Systems
Volume59
Issue number5
DOIs
StatePublished - Sep 1 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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