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19 April 2024

» arxiv » 0807.1682

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Study of the hadronic production of kaon pairs below the threshold for the phi meson
P. Moskal ; M. Silarski ; A. Budzanowski ; E. Czerwinski ; R. Czyzykiewicz ; D. Gil ; D. Grzonka ; M. Janusz ; L. Jarczyk ; B. Kamys ; A. Khoukaz ; P. Klaja ; W. Oelert ; C. Piskor-Ignatowicz ; J. Przerwa ; B. Rejdych ; J. Ritman ; T. Sefzick ; M. Siemaszko ; J. Smyrski ; A. Taschner ; P. Winter ; M. Wolke ; P. Wustner ; M. J. Zielinski ; W. Zipper ; J. Zdebik ;
Date:	11 Jul 2008
Abstract:	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 $phi$ 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.
Source:	arXiv, 0807.1682
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