Can low-lying Roper states be explained as antidecuplet members?

Abstract

It is shown that the anomalously low-lying Roper states cannot be assigned as pentaquarks with the scalar diquark - scalar diquark - antiquark structure as suggested by Jaffe and Wilczek.

Comments: Will appear in Phys. Rev. Lett. as a comment on the paper by R. Jaffe and F. Wilczek, Phys. Rev. Lett., 91, 232003 (2003)