Eur. Phys. J. A (2006) 27: 263-268
https://doi.org/10.1140/epja/i2005-10269-9

Nuclear Structure and Reactions

Aspects of φ-meson production in proton-proton collisions

¹ Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany
² Institut für Kernphysik (Theorie), Forschungszentrum Jülich GmbH, D-52425, Jülich, Germany

^* e-mail: j.haidenbauer@fz-juelich.de

Received: 19 December 2005
Accepted: 20 March 2006
Published online: 10 April 2006

Abstract

We analyze near-threshold cross-section data for the reaction pp → ppφ published by the DISTO Collaboration and recent, still preliminary results presented by the ANKE Collaboration. We formulate a procedure to evaluate the OZI ratio at low energies by taking into account corrections from the kinematics and the final-state interaction. Combining the new data with the few measurements available at higher energies we give a limit for the OZI rule violation. We also demonstrate and discuss the effect of a possible contribution from a five-quark baryonic resonance coupled to the φp system on the pp → ppφ cross-section and the φp and pp invariant mass spectra.