Θ+(1540) as a heptaquark with the overlap of a pion, a kaon, and a nucleon -: art. no. 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 nonexotic 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 canceled 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.