meson production in deuteron-proton collisions at COSY-ANKE

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• 作者：P. Goslawski ; ¹ ; ^{paul.goslawski@uni-muenster.de} ; I. Burmeister¹ ; M. Mielke¹ ; M. Papenbrock¹ ; D. Schrö ; er¹ ; A. Tä ; schner¹ ; A. Khoukaz¹
• 关键词：Eta production ; Quasi-bound states ; Storage rings ; Eta mass determination
• 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：370-374
• 文件大小：416 K

摘要

The ANKE spectrometer (Apparatus for studies of Nucleon and Kaon Ejectiles) situated at the COSY of the Froschungszentrum J眉lich is well suited to investigate meson production in deuteron-proton collisions, especially close to threshold. By studying the reaction , differential and total cross sections as well as the meson mass have been determined with high accuracy. The very rapid rise of the total cross section to its maximum value within the first 0.5聽MeV above the threshold implies a very large scattering length, i.e.,聽a very strong final state interaction, and might indicate the presence of a quasi-bound state extremely close to threshold. In order to clarify the unambiguous meson mass situation, a new measurement investigating the reaction at 12 fixed energies at COSY-ANKE was conducted. Using this two-body reaction, the meson mass can be extracted from pure kinematics through the determination of the production threshold. This requires to measure the final state momenta and the associated beam momenta with highest precision.