First measurement of the helicity-dependent (gamma)over-right-arrow(p)over-right-arrow -> p eta differential cross-section

Summary, in English

The helicity dependence of the (γ) over right arrow(p) over right arrow -+ peta reaction has been measured for the first time at a center-of-mass angle theta(eta)*= 70degrees in the photon energy range from 780 MeV 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. The helicity 3/2 cross-section is found to be small and the results for helicity 1/2 agree with predictions from the MAID analysis.

• Författare: J Ahrens; S Altieri; JRM Annand; G Anton; HJ Arends; K Aulenbacher; R Beck; C Bradtke; A Braghieri; 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; R van de Vyver; A Wakai; W Weihofen; F Wissmann; F Zapadtka; G Zeitler
• Avdelning/ar: MAX IV-laboratoriet
• Publiceringsår: 2003
• Språk: Engelska
• Sidor: 241-244
• Publikation/Tidskrift/Serie: European Physical Journal A. Hadrons and Nuclei
• Volym: 17
• Issue: 2
• Länkar: http://dx.doi.org/10.1140/epja/i2002-10153-2
• Dokumenttyp: Artikel i tidskrift
• Förlag: Springer
• Ämne: Natural Sciences; Physical Sciences
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 1434-6001