Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 9: Elektromagnetische und Hadronische Proben
HK 9.5: Vortrag
Freitag, 4. März 2005, 17:45–18:00, TU MA004
φ-meson production in pn collisions* — •Yoshikazu Maeda1, Michael Hartmann1, Irakli Keshelashvilli1, Rüdiger Koch1, Sergey Mikirtytchiants2, and Hans Ströher1 — 1Institut für Kernphysik, Forschungszentrum Jülich, ermany — 2High Energy Physics Department, Petersburg Nuclear Physics Institute, Russia
φ-meson production in both hadronic and electromagnetic
processes has attracted the interest for the investigation of hidden
strangeness in nucleon and the violation of the Okubo-Zweig-Iizuka rule.
At the ANKE facility of COSY Jülich,
first data of φ-meson production in pn collisions close
to threshold have been measured using a proton beam on a deuterium
cluster-jet target.
The reaction pn→dφ has been identified by detecting the fast
deuteron in coincidence with the K+K− pairs from the φ decay.
About 1000 clean events of φ-meson production have been accumulated.
The data cover an excess energy range up to 80 MeV exploiting Fermi motion
of the target neutron.
The total cross section and angular dependence at several energies
will be presented and discussed.
* supported by FZ-Jülich