Helicity Dependence Of The Gamma P -> N Pi Channels And Multipole Analysis In The Delta Region

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,K 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

EUROPEAN PHYSICAL JOURNAL A（2004）

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摘要

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.

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关键词

helicity dependence,multipole analysis,$\gamma

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