Study of the hadronic production of kaon pairs below the threshold for the phi meson

Details Study of the hadronic production of kaon pairs below the threshold for the phi meson Study of the hadronic production of kaon pairs below the threshold for the phi meson

2008-07-10

arxiv.org/abs/0807.1682v2

Nucl.Phys.Proc.Suppl.181-182:194-198,2008

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 5 figures, Talk given at International Workshop on e+ e- Collisions from Phi to Psi (PHIPSI08), Frascati, Italy, 7-10

Scientific paper

10.1016/j.nuclphysbps.2008.09.03

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.

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