Helicity amplitudes A(1/2) and A(3/2) for the D-13(1520) resonance obtained from the (gamma)over-right-arrow(p)over-right-arrow -> p pi(0) reaction
J Ahrens,S Altieri,Jrm Annand,Gisela Anton,HJ Arends,K. Aulenbacher,R Beck,C Bradtke,A Braghieri,N Degrande,N. d'Hose,Dieter 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,Takahiro Iwata,O. Jahn,P. Jennewein,T. Kageya,S. S. Kamalov,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,Ch. 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 +70 more
TL;DR: The helicity dependence of the gamma-->p-->-->-->ppi(0) reaction has been measured for the first time in the photon-energy range from 550 to 790 MeV.
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Abstract: The helicity dependence of the (γ) over right arrow(p) over right arrow -->ppi(0) reaction has been measured for the first time in the photon-energy range from 550 to 790 MeV. The experiment, performed at the Mainz microtron MAMI, used a 4pi -detector system, a circularly polarized, tagged photon beam, and a longitudinally polarized frozen-spin target. These data are predominantly sensitive to the D-13(1520) resonance and are used to determine its helicity amplitudes.
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