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- W2057027359 abstract "Striking regularities are observed in πN backward elastic scattering for plab ≳ 1 GeV. The rich structure of the polarization and differential cross section vary rapidly in both angle and energy. For a fixed energy however, the observables approximately satisfy the derivative relation P(θ) dσdθ ∝ ∂t6θ (dσdθ). This empirical relation is shown to be the consequence of the peripheral nature of the interaction at high energies and the dominance of successive partial waves with increasing energy W = √s at lower energies: l = 2,3,4 … for W = 1.68, 1.95, 2.18 … GeV, respectively. “l-dominance” suggests a pattern where N,Δ and Δ,Δ states appear in nearly degenerate pairs with the same l and parity but with J = l + 12 and J = l − 12. The observed regularities are consistent with measurements in the inelastic channel π−p → ΛK0 and could provide a useful tool for an extension of phase-shift analyses to higher energies where no prominent peaks in the total cross section constrain the solution. At the highest energy (plab = 6 GeV/c) a possible deviation from the derivative rule implies the onset of a non-peripheral contribution not present at lower energies." @default.
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- W2057027359 date "1976-10-01" @default.
- W2057027359 modified "2023-09-25" @default.
- W2057027359 title "Backward polarization as a direct experimental measure of peripherality" @default.
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- W2057027359 doi "https://doi.org/10.1016/0550-3213(76)90017-1" @default.
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