The first virtual compton scattering experiment at MAMI

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• 作者：S. Kerhoas ; P. Bartsch ; J. Berthot ; P. Y. Bertin ; V. Breton ; W. U. Boeglin ; R. Bö ; hm ; N. d'Hose ; T. Caprano ; S. Derber ; N. Degr ; e ; M. Ding ; M. Distler ; J. E. Ducret ; R. Edelhoff ; I. Ewald ; H. Fonvieille ; J. Friedrich ; J. M. Friedrich ; R. Geiges ; et al.
• 刊名：Nuclear Physics A
• 出版年：2000
• 出版时间：13 March 2000
• 年：2000
• 卷：666-667
• 期：Complete
• 页码：44-47
• 全文大小：214 K

文摘

Virtual Compton scattering, i.e. the exclusive reaction γ^*p → γ′p′ with γ^* denoting a virtual photon, provides new insights on the internal structure of the proton. Below π⁰ 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 (α0 and magnetic (β) 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 GeV² and we present in this paper the preliminary results.