Study of the hadronic production of kaon pairs below the threshold for the
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- 作者：P. Moskal ; M. Silarski ; A. Budzanowski ; E. Czerwiń ; ski ; R. Czyż ; ykiewicz ; D. Gil ; D. Grzonka ; M. Janusz ; L. Jarczyk ; B. Kamys ; A. Khoukaz ; P. Klaja ; W. Oelert ; C. Piskor-Ignatowicz ; J. Przer
- 刊名：Nuclear Physics B - Proceedings Supplements
- 出版年：2008
- 出版时间：September 2008
- 年：2008
- 卷：181-182
- 期：Complete
- 页码：194-198
- 全文大小：322 K
文摘
The near threshold production of K+K− pairs in proton-proton collisions has been investigated at the cooler synchrotron COSY below and above the threshold for the meson using the COSY-11 and ANKE facilities, respectively. The excitation function determined for the pp→ppK+K− reaction revealed a statistically significant enhancement close to the threshold which may plausibly be assigned to the influence of the K−p interaction. In addition, observed consistently by both groups, a strong enhancement at low values of the ratio of the K−p to K+p invariant mass distributions shows that the proton interacts much stronger with K− than with K+. In this report we focus on the measurements performed by the COSY-11 collaboration. We explain the experimental method used and present main results of completed analyses as well as a new qualitative elaboration of the ppK+K− events population on the Goldhaber plot. We conclude with the observation that event densities increase at the region where the influence from the K+K− interaction is expected.