Q. J. Ye, M. Hartmann, Y. Maeda, S. Barsov, M. Buescher, D. Chiladze, S. Dymov, A. Dzyuba, H. Gao, R. Gebel, V. Hejny, A. Kacharava, I. Keshelashvili, Yu. T. Kiselev, A. Khoukaz, V. P. Koptev, P. Kulessa, A. Kulikov, B. Lorentz, T. Mersmann, S. Merzliakov, S. Mikirtytchiants, M. Nekipelov, H. Ohm, E. Ya. Paryev, A. Polyanskiy, V. Serdyuk, H. J. Stein, H. Stroeher, S. Trusov, Yu. Valdau, C. Wilkin, P. Wuestner
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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http://arxiv.org/abs/1202.5451
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