Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 41: Heavy Ions IV

HK 41.5: Talk

Thursday, March 11, 2004, 15:30–15:45, E

Φ-mesons measured in FOPI spectrometer — •Zbigniew Tyminski — Gesellschaft für Schwerionenforschung, Darmstadt, Germany — Warsaw University, Poland

Taking advantage of a high statistics data run with FOPI for the system ⁵⁸Ni+⁵⁸Ni at 1.93 AGeV the question of Φ meson production in HI - collisions is revisited. From the reconstruction of the Φ invariant mass from K⁺ K⁻ candidates, we find about 200 Φ mesons with a signal to background of S/B=0.7 . This is enough to estimate the slope parameter of the kinetic energy distribution in the CM frame and extract the total yields. Combining the Φ yield with previously measured K⁻ yield allows to check the sensitivity of various reaction channels, as implemented in transport models.