Structure of light and heavy pentaquarks

Abstract

Light and heavy pentaquarks are described within a constituent quark model based on a spin-flavor hyperfine interaction. In this model the lowest state acquires positive parity. The masses of the light antidecuplet members are calculated dynamically using a variational method. It is shown that the octet and antidecuplet states with the same quantum numbers mix ideally due to SU(3)${}_F$ breaking. Masses of the charmed antisextet pentaquarks are predicted within the same model.

Comments: 6 pages, 2 figures, Plenary talk at the 10th International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon (MENU04), Beijing, August 29 - September 4, 2004, reference added