Suggestion of a New Dinucleon Resonance in an Isosinglet, Negative-Parity State

Abstract

On the basis of np phase shifts reported in the preceding paper, we suggest an isospin I=0 np resonance as responsible for the structures observed in three or four independent quantities. The most plausible candidate is the ¹F₃ state. Its Breit-Wigner parameters are M_R∼2.19GeV, Γ_el∼50 MeV and Γ_el/Γ∼0.12. This structure in the ¹F₃ wave explains half of the observed sharp rising of the σ_r(I=0) above 1.1GeV/c and is compatible with the experimental peak in the Δσ_L(I=0) as well as with the shoulder in the σ_tot(np) around 1.4GeV/c.