Isospin Mixing of Narrow Pentaquark States

Details Isospin Mixing of Narrow Pentaquark States Isospin Mixing of Narrow Pentaquark States

2004-04-29

arxiv.org/abs/hep-ph/0404262v1

Phys.Lett. B597 (2004) 338-345

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 2 figures, to be submitted to PLB

Scientific paper

10.1016/j.physletb.2004.07.042

Interpreting the recently discovered narrow exotic baryons as pentaquark states, we discuss, along an old argument of ours, the isospin mixing occurring within the two doublets of $Q = -1$ and Q=0 states lying inside the $S=-2$ ($\Xi$-cascade) sector. We argue that, at least within the Jaffe-Wilczek assignment, presently available data already indicate that mixing should occur at an observable level in both charge sectors, with mixing angles that can be predicted in terms of ratios of observable mass splittings.

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