Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-08-06
Phys.Rev. D69 (2004) 011503
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 5 figures, 2 tables, submitted to Phys. Rev. D, rapid communication
Scientific paper
10.1103/PhysRevD.69.011503
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 a heptaquark, equivalent to a N+pi+K borromean bound-state, 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. We conclude with predictions that can be tested experimentally.
Bicudo Pedro
Marques G. M.
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