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HK: Hadronen und Kerne

HK 62: Hadronic Probes VI, Resonances, Reactions

HK 62.7: Talk

Thursday, March 19, 1998, 16:00–16:15, C

Planned study of a₀⁺ mesons using the reaction pp→ da₀⁺ → dK⁺K⁰ at ANKE/COSY — •M. Büscher¹, Ye.S. Golubeva², L. Kondratyuk³, and V. Tchernyshev³ — ¹Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich — ²Institute for Nuclear Research, Russian Academy of Sciences, Moscow 117312, Russia — ³Institute for Theoretical and Experimental Physics, Cheremushkinskaya 25, 117259 Moscow, Russia

We want to measure the cross section of the reaction pp→ da₀⁺ → dK⁺K⁰ and the mass spectra of the K⁺K⁰ system at energies T_p 2.52… 2.60 GeV at the cooler synchrotron COSY-Jülich using the spectrometer ANKE and a high-density frozen-pellet target. In this way we wish to find out whether the a₀⁺ is a real resonance or a K⁺K⁰ threshold-cusp effect. The results of model calculations on a₀⁺ production as well as the planned experimental setup will be discussed. According to our simulation calculations, we expect a few thousand events of a₀⁺ decays into K⁺K⁰ per week with very little background from other reaction channels. Due to a momentum resolution of Δ p/p ≈ 1.5% for the deuterons detected in coincidence with the K⁺ mesons we expect a missing-mass resolution of Δ m/m (a₀⁺)≈ 0.7% which should be good enough to draw conclusions about the structure of this meson.