Helicity dependence of the gamma p -> N pi channels and multipole analysis in the Delta region

Summary, in English

A high-quality double-polarization data set for the helicity dependence of the total and differential cross-sections for both gammap --> Npi channels in the Delta region has been obtained in the framework of the GDH experiment. The experiment, performed at the Mainz microtron MAMI, used a 4pi detection system, a circularly polarized photon beam, and a longitudinally polarized frozen-spin target. These data are included in the database to perform a multipole analysis to determine the properties of the Delta(1232)-resonance. For the resonant Delta(1232) multipoles we find a very good agreement with previous analyses, while the nonresonant ones show significant deviations.

• Author: J Ahrens; S Altieri; JRM Annand; G Anton; HJ Arends; K Aulenbacher; R Beck; C Bradtke; A Braghieri; N Degrande; N d'Hose; D Drechsel; H Dutz; S Goertz; P Grabmayr; Kurt Hansen; J Harmsen; D von Harrach; S Hasegawa; T Hasegawa; E Heid; K Helbing; H Holvoet; L Van Hoorebeke; N Horikawa; T Iwata; O Jahn; P Jennewein; T Kageya; B Kiel; F Klein; R Kondratiev; K Kossert; J Krimmer; M Lang; B Lannoy; R Leukel; V Lisin; T Matsuda; JC McGeorge; A Meier; D Menze; W Meyer; T Michel; J Naumann; A Panzeri; P Pedroni; T Pinelli; I Preobrajenski; E Radtke; E Reichert; G Reicherz; C Rohlof; G Rosner; D Ryckbosch; M Sauer; B Schoch; M Schumacher; B Seitz; T Speckner; N Takabayashi; G Tamas; A Thomas; L Tiator; R van de Vyver; A Wakai; W Weihofen; F Wissmann; F Zapadtka; G Zeitler
• Department/s: MAX IV Laboratory
• Publishing year: 2004
• Language: English
• Pages: 323-333
• Publication/Series: European Physical Journal A. Hadrons and Nuclei
• Volume: 21
• Issue: 2
• Links: http://dx.doi.org/10.1140/epja/i2003-10216-x
• Document type: Journal article
• Publisher: Springer
• Topic: Physical Sciences; Natural Sciences
• Status: Published
• ISBN/ISSN/Other: ISSN: 1434-6001