Time Delay Plots of Unflavoured Baryons
نویسندگان
چکیده
We explore the usefulness of the existing relations between the S-matrix and time delay in characterizing baryon resonances in pionnucleon scattering. We draw attention to the fact that the existence of a positive maximum in time delay is a necessary criterion for the existence of a resonance and should be used as a constraint in conventional analyses which locate resonances from poles of the S-matrix and Argand diagrams. The usefulness of the time delay plots of resonances is demonstrated through a detailed analysis of the time delay in several partial waves of πN elastic scattering. PACS numbers: 14.20.Gk, 13.85.Dz, 03.65.Nk
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