Pentaquark spectrum in string dynamics

Abstract

The masses of $uudd\bar{s}$ and $uudd\bar{d}$ pentaquarks are evaluated in a framework of the Effective Hamiltonian approach to QCD using the Jaffe-Wilczek $[ud{]}^2\bar{q}$ approximation. The mass of the $[ud{]}^2\bar{s}$ state is found to be $\sim 300-500$ MeV higher than the observed ${\Theta }^{+}(1540)$ mass.

Comments: 6 pages, 1 figure included, LaTeX2e; several references added; misprints corrected; to appear in Physics Letters B