Search for Quadrupole Strength in the Electroexcitation of the Δ+(1232)

C. Mertz et al.
Phys. Rev. Lett. 86, 2963 – Published 2 April 2001
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Abstract

High-precision 1H(e,ep)π0 measurements at Q2=0.126(GeV/c)2 are reported, which allow the determination of quadrupole amplitudes in the γ*NΔ transition; they simultaneously test the reliability of electroproduction models. The derived quadrupole-to-dipole ( I=3/2) amplitude ratios, RSM=(6.5±0.2stat+sys±2.5mod)% and REM=(2.1±0.2stat+sys±2.0mod)%, are dominated by model error. Previous RSM and REM results should be reconsidered after the model uncertainties associated with the method of their extraction are taken into account.

  • Received 13 November 2000

DOI:https://doi.org/10.1103/PhysRevLett.86.2963

©2001 American Physical Society

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Vol. 86, Iss. 14 — 2 April 2001

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