The production of K+K- pairs in proton-proton collisions at 2.83 GeV


The production of K+K- pairs in proton-proton collisions at 2.83 GeV

Ye, Q. J.; Hartmann, M.; Maeda, Y.; Barsov, S.; Buescher, M.; Chiladze, D.; Dymov, S.; Dzyuba, A.; Gao, H.; Gebel, R.; Hejny, V.; Kacharava, A.; Keshelashvili, I.; Kiselev, Y. T.; Khoukaz, A.; Koptev, V. P.; Kulessa, P.; Kulikov, A.; Lorentz, B.; Mersmann, T.; Merzliakov, S.; Mikirtytchiants, S.; Nekipelov, M.; Ohm, H.; Paryev, E. Y.; Polyanskiy, A.; Serdyuk, V.; Stein, H. J.; Stroeher, H.; Trusov, S.; Valdau, Y.; Wilkin, C.; Wuestner, P.

Differential and total cross sections for the pp -> ppK+K- reaction have been measured at a proton beam energy of 2.83 GeV using the COSY-ANKE magnetic spectrometer. Detailed model descriptions fitted to a variety of one-dimensional distributions permit the separation of the pp -> pp phi cross section from that of non-phi production. The differential spectra show that higher partial waves represent the majority of the pp -> pp phi total cross section at an excess energy of 76 MeV, whose energy dependence would then seem to require some s-wave phi-p enhancement near threshold. The non-phi data can be described in terms of the combined effects of two-body final state interactions using the same effective scattering parameters determined from lower energy data.

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Publ.-Id: 16863