Experimental approaches for determining in-medium properties of hadrons from photo-nuclear reactions

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• 作者：V. Metag^a ; ¹ ; ^{Volker.Metag@exp2.physik.uni-giessen.de} ; M. Thiel^a ; ¹ ; ² ; H. Berghä ; user^a ; ¹ ; S. Friedrich^a ; B. Lemmer^a ; ¹ ; ³ ; U. Mosel^b ; J. Weil^b
• 关键词：Meson photoproduction ; In-medium properties ; Light vector mesons
• 刊名：Progress in Particle and Nuclear Physics
• 出版年：2012
• 期刊代码：64_01466410
• 类别：ph
• 出版时间：April, 2012
• 卷：67
• 期：2
• 页码：530-535
• 文件大小：714 K

摘要

Properties of hadrons and their modification within strongly interacting matter provide a link between experimental observables and Quantum Chromodynamics (QCD) in the non-perturbative sector. The sensitivity of various observables to in-medium modifications of mesons is discussed. The transparency ratio, comparing the meson yield per nucleon within a nucleus relative to that on a free nucleon, is related to the in-medium width of the meson. While the transparency ratio can be determined for any meson lifetime, the meson line shape only contains information on in-medium properties if the meson is so short-lived that it decays in the medium after production in a nuclear reaction. Light vector mesons are thus particularly suited for these investigations. The momentum distribution of mesons produced in a photo-nuclear reaction as well as the excitation function also show some sensitivity to different in-medium modification scenarios. As an example, high statistics data taken at MAMI-C on the photoproduction of mesons are presented.