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- W2149352212 abstract "Exchange of nonstatic pions between a nucleon and Δ(1231) isobar in the reactions NN → NN and NN → NΔ is studied near the pion- and Δ-production thresholds. The nonstatic nature of the exchange permits the repeated formation and decay of a nearly on-shell isobar as the pion shuttles back and forth on its mass shell. The mechanism modifies the analysis of NN elastic and Δ production processes at intermediate range (≈ 12Mπ−1). We examine these effects in a relativistic theory, restricted to spinless particles, based on the covariant off-shell formalism of Blankenbecler and Sugar. Three versions of this theory are considered, involving intermediate nucleon-isobar propagation taken off the mass shell (i) symmetrically, (ii) nonsymmetrically, and (iii) in a quasiparticle formulation. For the mechanism considered here, a clear preference is found for the nonsymmetrical prescription. Our results indicate that the nonstatic multiple-pion-exchange mechanism should be included in quantitative analyses of NN → NN, NΔ in the threshold regions for pion and Δ production." @default.
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- W2149352212 date "1977-03-01" @default.
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- W2149352212 title "Multiple pion exchange in a nonstatic theory of nucleon-nucleon scattering and isobar production" @default.
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- W2149352212 doi "https://doi.org/10.1016/0375-9474(77)90094-x" @default.
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