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26 April 2024

» arxiv » nucl-ex/9902012

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Search for Quadrupole Strength in the Electro-excitation of the Delta(1232)
C. Mertz ; C. 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 ;
Date:	24 Feb 1999
Journal:	Phys.Rev.Lett. 86 (2001) 2963-2966
Subject:	nucl-ex
Abstract:	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.
Source:	arXiv, nucl-ex/9902012
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