The Theta+ (1540) as an overlap of a pion, a kaon and a nucleon

Details The Theta+ (1540) as an overlap of a pion, a kaon and a nucleon The Theta+ (1540) as an overlap of a pion, a kaon and a nucleon

2003-12-31

arxiv.org/abs/hep-ph/0312391v1

AIP Conf.Proc. 717 (2004) 467-474

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures, 1 table, contribution to the X International Conference on Hadron Spectroscopy, HADRON 2003, August 31 - S

Scientific paper

10.1063/1.1799751

We study the very recently discovered $\Theta^+$ (1540) at SPring-8, at ITEP and at CLAS-Thomas Jefferson Lab. We apply the same RGM techniques that already explained with success the repulsive hard core of nucleon-nucleon, kaon-nucleon exotic scattering, and the attractive hard core present in pion-nucleon and pion-pion non-exotic scattering. We find that the K-N repulsion excludes the Theta+ as a K-N s-wave pentaquark. We explore the Theta+ as heptaquark, equivalent to a N+pi+K borromean boundstate, with positive parity and total isospin I=0. We find that the kaon-nucleon repulsion is cancelled by the attraction existing both in the pion-nucleon and pion-kaon channels. Although we are not yet able to bind the total three body system, we find that the Theta+ may still be a heptaquark state.

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