Measurement of the invariant mass distributions for the pp→ppη^′ reaction at excess energy of Q=16.4 MeV

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• 作者：P. Klaja ; P. Moskal ; E. Czerwiń ; ski ; R. Czyż ; ykiewicz ; A. Deloff ; D. Gil ; D. Grzonka ; L. Jarczyk ; B. Kamys ; A. Khoukaz ; J. Klaja ; K. Nakayama ; W. Oelert ; J. Ritman ; T. Sefzick ; M. Siemaszko
• 关键词：Pseudoscalar mesons ; Differential distributions ; Near threshold meson production ; Interaction
• 刊名：Physics Letters B
• 出版年：2010
• 出版时间：1 February 2010
• 年：2010
• 卷：684
• 期：1
• 页码：11-16
• 全文大小：385 K

文摘

The proton–proton and proton–η^′ invariant mass distributions have been determined for the pp→ppη^′ reaction at an excess energy of Q=16.4 MeV. The measurement was carried out using the COSY-11 detector setup and the proton beam of the cooler synchrotron COSY. The shapes of the determined invariant mass distributions are similar to those of the pp→ppη reaction and reveal an enhancement for large relative proton–proton momenta. This result, together with the fact that the proton–η interaction is much stronger that the proton–η^′ interaction, excludes the hypothesis that the observed enhancement is caused by the interaction between the proton and the meson.