The first virtual compton scattering experiment at MAMI

✍ Scribed by S Kerhoas; P Bartsch; J Berthot; P.Y Bertin; V Breton; W.U Boeglin; R Böhm; N d'Hose; T Caprano; S Derber; N Degrande; M Ding; M Distler; J.E Ducret; R Edelhoff; I Ewald; H Fonvieille; J Friedrich; J.M Friedrich; R Geiges; Th Gousset; P.A.M Guichon; H Holvoet; Ch Hyde-Wright; P Jennewein; M Kahrau; M Korn; H Kramer; K.W Krygier; V Kunde; B Lannoy; D Lhuillier; A Liesenfeld; C Marchand; D Marchand; J Martino; H Merkel; K Merle; P Merle; G De Meyer; J Mougey; R Neuhausen; Th Pospischil; G Quemener; O Ravel; Y Roblin; J Roche; D Rohe; G Rosner; D Ryckbosch; P Sauer; H Schmieden; S Schardt; G Tamas; M Tytgat; M Vanderhaeghen; L Van Hoorebeke; R Van de Vyver; J Van de Wiele; P Vernin; A Wagner; Th Walcher

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 214 KB
• Volume: 666-667
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(00)00009-9

✦ Synopsis

Virtual Compton scattering, i.e. the exclusive reaction 7*P ~ 7'P' with 7" denoting a virtual photon, provides new insights on the internal structure of the proton. Below 7r ° production threshold, this experiment measures the generalized polarizabilities of the proton as defined by Guichon et al [1], [2] and Drechsel et al [3]. These new electromagnetic observables, functions of Q2 enlarge the concept of electric (a) and magnetic (~) polarizabilities in Real Compton Scattering (Q2=0) [4]. The first VCS experiment [5] of this kind was measured at the three spectrometer facility at the Mainz Microtron MAMI for Q2=0.33 GeV 2 and we present in this paper the preliminary results.