Kaon pair production in proton-proton collisions at COSY-ANKE
1 Department of Physics and Triangle Universities Nuclear Laboratory, Duke University, Durham, NC 27708, USA
2 Institut für Kernphysik and Jülich Centre for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany
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The near-threshold production of kaon-pairs has been investigated in proton-proton collisions at Cooler Synchrotron (COSY)at Forschungszentrum Jülich. In the pp → ppK+K− reaction, the invariant mass distributions of K−p, K−pp, and K+K− indicate the presence of both K−p and K+K− final state interactions. Total cross sections for pp → ppϕ reaction have been determined at excess energies ε of 18.5, 34.5, and 76 MeV. The differential spectra at an excess energy of 18.5 MeV exhibit a clear s-wave dominance, while the high statics data at an excess energy of 76 MeV shows that higher partial waves represent the majority of the pp → ppϕ total cross section, whose energy dependence would then seem to require some s-wave ϕp enhancement near threshold.
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