Search for quadrupole strength in the electroexcitation of the delta+(1232).

C Mertz, C E Vellidis,R Alarcon, D H Barkhuff, A M Bernstein, W Bertozzi,V Burkert, J Chen,J R Comfort, G Dodson, S Dolfini,K Dow, M Farkhondeh,J M Finn,S Gilad, R W Gothe, X Jiang,K Joo, N I Kaloskamis, A Karabarbounis, J J Kelly,S Kowalski,C Kunz,R W Lourie,J I McIntyre, B D Milbrath,R Miskimen,J H Mitchell,C N Papanicolas,C F Perdrisat,A J Sarty,J Shaw, S B Soong, D Tieger, C Tschalaer, W Turchinetz,P E Ulmer,S Van Verst, G A Warren,L B Weinstein,S Williamson, R J Woo,A Young

PHYSICAL REVIEW LETTERS（2001）

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摘要

High-precision 1H(e,e'p)pi(0) measurements at Q2 = 0.126 (GeV/c)2 are reported, which allow the determination of quadrupole amplitudes in the gamma*N-->Delta transition; they simultaneously test the reliability of electroproduction models. The derived quadrupole-to-dipole ( I = 3/2) amplitude ratios, R(SM) = (-6.5+/-0.2(stat+sys)+/-2.5(mod))% and R(EM) = (-2.1+/-0.2(stat+sys)+/-2.0(mod))%, are dominated by model error. Previous R(SM) and R(EM) results should be reconsidered after the model uncertainties associated with the method of their extraction are taken into account.

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