Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 5: Electromagnetic and Hadronic Probes I

HK 5.7: Vortrag

Montag, 11. März 2002, 18:15–18:30, D

Two Kaon Production at the φ - Meson Threshold with the MOMO-Experiment at COSY — •R. Jahn¹, F. Bellemann¹, A. Berg¹, J. Bisplinghoff¹, G. Bohlscheid¹, J. Ernst¹, F. Hinterberger¹, R. Ibald¹, L. Jarczyk², R. Joosten¹, A. Kozela³, H. Machner⁴, A. Magiera², R. Maschuw¹, T. Mayer-Kuckuk¹, G. Mertler¹, J. Munkel¹, P.v. Rossen⁴, H. Schnitker¹, J. Smyrski², A. Strzalkowski², and R. Tölle⁴ — ¹Institut für Strahlen- und Kernphysik, Universität Bonn — ²Institute of Physics, Jagellonian University Cracow, Poland — ³Institute of Nuclear Physics, Cracow, Poland — ⁴Institut für Kernphysik, Forschungszentrum Jülich

The reaction pd → ³He K⁺ K⁻ was measured kinematically complete at the COSY synchroton at beam momenta near 2.6 GeV/c corresponding to c.m. energies above the K⁺ K⁻ threshold of 35 MeV, 40 MeV and 56 MeV. In total, some 6000 kaon pairs could be uniquely identified. The KK mass spectra are consistent with phase space topped by a clear signal of the φ meson, even at 35 MeV, which corresponds to just 2.8 MeV avbove the φ threshold. In contrast to the MOMO two pion production data measured with the reaction pd → ³He π⁺ π⁻ (Phys. Rev. C60 (1999) 061002) the two kaon angular distributions indicate pure s-wave production. The obtained cross sections, ranging into the sub-nanobarn domain, will be presented and discussed.
Supported by the BMBF.