Eur. Phys. J. A (2007) 31: 95-104
https://doi.org/10.1140/epja/i2006-10161-2

Regular Article - Hadron Physics

Study of ω-meson production in pp collisions at ANKE

¹ High Energy Physics Department, Petersburg Nuclear Physics Institute, 188350, Gatchina, Russia
² Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany
³ Physikalisches Institut II, Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
⁴ High Energy Physics Institute, Tbilisi State University, 0186, Tbilisi, Georgia
⁵ Institut für Kernphysik, Universität Münster, 48149, Münster, Germany
⁶ Institute of Nuclear Physics, 31342, Cracow, Poland
⁷ Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980, Dubna, Russia
⁸ Physics and Astronomy Department, University of Glasgow, Glasgow, UK
⁹ Research Center for Nuclear Physics, Osaka University, Ibaraki, 567-0047, Osaka, Japan
¹⁰ Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, 01314, Dresden, Germany
¹¹ Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, 119992, Moscow, Russia
¹² Zentralinstitut für Elektronik, Forschungszentrum Jülich, 52425, Jülich, Germany
¹³ Physics and Astronomy Department, UCL, WC1E 6BT, London, UK

^* e-mail: r.schleichert@fz-juelich.de

Received: 29 August 2006
Accepted: 12 December 2006
Published online: 16 January 2007

Abstract

The production of ω-mesons in the pp → ppω reaction has been investigated with the COSY-ANKE spectrometer for excess energies of 60 and 92MeV by detecting the two final protons and reconstructing their missing mass. The large physical background was subtracted using an event-by-event transformation of the proton momenta between the two energies. Differential distributions and total cross-sections were obtained after careful studies of possible systematic uncertainties in the overall ANKE acceptance. The results are compared with the predictions of theoretical models. Combined with data on the φ-meson, a more refined estimate is made of the Okubo-Zweig-Iizuka rule violation in the φ/ω production ratio.