Abstract
Additional broader states in the KN channel near are expected in many models, making the absence of any signature in the -deuteron scattering data even more puzzling. In an ideal “three-body” picture the is viewed as two compact color diquarks and an quark. A “QCD-type” inequality involving the mass of the excitation, and that of a new tetraquark vector meson then follows. The inequality suggests a very light new vector meson, and is violated. We note that “associated production” of the pentaquark with another quadriquark or antipentaquark may be favored. This along with some estimates of the actual production cross sections suggest that the can be found in BaBar or Belle colliders.
- Received 3 March 2004
DOI:https://doi.org/10.1103/PhysRevD.69.116001
©2004 American Physical Society