Search for Quadrupole Strength in the Electroexcitation of the Delta+ (1232)
Journal Article
·
· Physical Review Letters
High precision 1H(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 (I = 3/2) amplitude ratios, RSM = (-6.5 +/- 0.2stat+sys+/-2.5mod)% and REM = 9-2.1 +/-0.2stat+sys +/-2.0mod)%, 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.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 833903
- Report Number(s):
- JLAB-PHY-01-76; DOE/ER/40150-2931; nucl-ex/9902012; PRLTAO; TRN: US0703124
- Journal Information:
- Physical Review Letters, Vol. 86, Issue 14; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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