Phys. Rev. Lett. 86, 2963–2966 (2001)Search for Quadrupole Strength in the Electroexcitation of the Δ+(1232)Received 13 November 2000; published in the issue dated 2 April 2001 High-precision 1H(e,e′p)π0 measurements at Q2 = 0.126(GeV/c)2 are reported, which allow the determination of quadrupole amplitudes in the γ*N→Δ 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. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.2963
DOI:
10.1103/PhysRevLett.86.2963
PACS:
14.20.Gk, 13.60.Le, 25.30.Rw
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