Comment on "Evidence for Narrow Baryon Resonances in Inelastic ρρ Scattering"

Abstract

In a recent Letter [1], Tatischeff et al. claimed evidence for three neutral baryon resonances N* between the nucleon and the Δ(1232). Two of these have masses M = 1004 and 1044 MeV below mN + mπ and thus their widths (Γ = ­4 to 15 MeV) are radiative. The third resonance M = 1094 MeV) also might have a radiative decay. All of the resonances have to contribute to Compton scattering on the nucleon and result in peaks at energies Eγ 68, 112, and 169 MeV, respectively, which were never observed on protons [2–5] or neutrons [6,7] loosely bound in the deuteron. Since constraints of this type are very sensitive and were not analyzed in the Letter, we give estimates...