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25 April 2024

» pubmed » pmid11290083

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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 ;
Date:	2 Apr 2001
Journal:	Phys Rev Lett, 86 (14), 2963-6
Abstract:	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.
Source:	PubMed, pmid11290083
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