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

Authors
Mertz, C Vellidis, CE Alarcon, R Barkhuff, DH Bernstein, AM Bertozzi, W Burkert, V Chen, J Comfort, JR Dodson, G Dolfini, S Dow, K Farkhondeh, M Finn, JM Gilad, S Gothe, RW Jiang, X Joo, K Kaloskamis, NI Karabarbounis, A Kelly, JJ Kowalski, S Kunz, C Lourie, RW McIntyre, JI Milbrath, BD Miskimen, R Mitchell, JH Papanicolas, CN Perdrisat, CF Sarty, AJ Shaw, J Soong, SB Tieger, D Tschalaer, C Turchinetz, W Ulmer, PE Van Verst, S Warren, GA Weinstein, LB Williamson, S Woo, RJ Young, A
Citation
C. Mertz et al., Search for quadrupole strength in the electroexcitation of the Delta(+)(1232), PHYS REV L, 86(14), 2001, pp. 2963-2966
Citations number
30
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
86
Issue
14
Year of publication
2001
Pages
2963 - 2966
Database
ISI
SICI code
0031-9007(20010402)86:14<2963:SFQSIT>2.0.ZU;2-3
Abstract
High-precision H-1(e,e 'p)pi (0) measurements at Q(2) = 0.126 (GeV/c)(2) ar e reported, which allow the determination of quadrupole amplitudes in the g amma *N --> Delta transition; they simultaneously test the reliability of e lectroproduction models. The derived quadrupole-to-dipole (I = 3/2) amplitu de 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-S M and R-EM results should be reconsidered after the model uncertainties ass ociated with the method of their extraction are taken into account.