A Naturally Narrow Positive Parity Theta^+

Details A Naturally Narrow Positive Parity Theta^+ A Naturally Narrow Positive Parity Theta^+

2003-12-22

arxiv.org/abs/hep-ph/0312325v4

Phys.Rev. D70 (2004) 037501

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 1 figure, Revtex4, two-column format, version to be published in Phys. Rev. D, includes numerical estimates of decay

Scientific paper

10.1103/PhysRevD.70.037501

We present a consistent color-flavor-spin-orbital wave function for a positive parity Theta^+ that naturally explains the observed narrowness of the state. The wave function is totally symmetric in its flavor-spin part and totally antisymmetric in its color-orbital part. If flavor-spin interactions dominate, this wave function renders the positive parity Theta^+ lighter than its negative parity counterpart. We consider decays of the Theta^+ and compute the overlap of this state with the kinematically allowed final states. Our results are numerically small. We note that dynamical correlations between quarks are not necessary to obtain narrow pentaquark widths.

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