Search for Quadrupole Strength in the Electro-excitation of the Delta(1232)

Search for Quadrupole Strength in the Electro-excitation of the Delta(1232)

Phys.Rev.Lett.86:2963-2966,2001 High-precision H(e,e'p)pi0 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...

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Hauptverfasser: Mertz, C, Vellidis, C, Alarcon, R, Barkhuff, D. H, Bernstein, A. M, Bertozzi, W, Burkert, V, Chen, J, Comfort, J. R, Dodson, G, Dolfini, S, Dow, K, Farkhondeh, M, Finn, J. M, Gilad, S, Gothe, R. W, Jiang, X, Joo, K, Kaloskamis, N. I, Karabarbounis, A, Kelly, J. J, Kowalski, S, Kunz, C, Lourie, R. W, McIntyre, J. I, Milbrath, B. D, Miskimen, R, Mitchell, J. H, Papanicolas, C. N, Perdrisat, C. F, Sarty, A. J, Shaw, J, Soong, S. -B, Tieger, D, Tschalaer, C, Turchinetz, W, Ulmer, P. E, Van Verst, S, Warren, G. A, Weinstein, L. B, Williamson, S, Woo, R. J, Young, A
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Sprache:eng
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Physics - Nuclear Experiment
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Zusammenfassung:Phys.Rev.Lett.86:2963-2966,2001 High-precision H(e,e'p)pi0 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 amplitude ratios, Rsm=(-6.5 +- 0.2{stat+sys} +- 2.5{mod}) % and Rem=(-2.1 +- 0.2{stat+sys} +- 2.0{mod}) %, 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.
DOI:10.48550/arxiv.nucl-ex/9902012