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We present an alternative method for calculating amplitudes for correlated pipi exchange in the ``sigma'' and rho channel in piN scattering. Starting from afixed mass meson exchange potential, we introduce the width of the exchangedparticles by integrating over a mass spectral function. The spectral functionsare constructed from the pseudoempirical N\bar{N} -> pi pi data. Using thisapproach we develop a prescription for resolving ambiguities of the correlatedpi pi exchange in the rho channel that occur when different dispersiontheoretical formulations of rho exchange are used to construct piN potentials.Comment: 17 pages, 5 figures, uses revtex and epsfi

physical review. c. nuclear physics/physical review. c, nuclear physics

What does “ρ exchange” in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi><mml:mi>N</mml:mi></mml:math>scattering mean?

What does “ρ exchange” inπNscattering mean?