Comparison of isoscalar vector meson production cross sections in proton-proton collisions

Abdel-Bary, M.; Morsch, H. P.; Wenzel, R.; Clement, H.; Brinkmann, K.-T.; Abdel-Samad, S.; Wirth, S.; Kilian, K.; Gillitzer, A.; Kuhlmann, E.; Dietrich, J.; Freiesleben, H.; Doroshkevich, E.; Ritman, J.; Hesselbarth, D.; Wilms, A.; Schulte-Wissermann, M.; Zupranski, P.; Marcello, S.; Michel, P.; Filippi, A.; Eyrich, W.; Karsch, L.; Wagner, M.; Sun, G. J.; Erhardt, A.; Jä, R.; Ullrich, W.; Roderburg, E.; Steinke, M.; COSY-TOF, Coll.; Mö, K.; Ehrhart, K.; Fritsch, M.; Schö, P.; Pizzolotto, C.; Schroeder, W.; Wintz, P.; Dshemuchadse, S.; Plettner, C.

doi:10.1016/j.physletb.2007.02.046

Journal Article

Comparison of isoscalar vector meson production cross sections in proton-proton collisions

Abdel-Bary, M.FZJ* ; Abdel-Samad, S.FZJ* ; Brinkmann, K.-T. ; Clement, H. ; Dietrich, J. ; Doroshkevich, E. ; Dshemuchadse, S. ; Ehrhart, K. ; Erhardt, A. ; Eyrich, W. ; Filippi, A. ; Freiesleben, H. ; Fritsch, M. ; Gillitzer, A.FZJ* ; Hesselbarth, D.FZJ* ; Jä, R. ; Karsch, L. ; Kilian, K.FZJ* ; Kuhlmann, E. ; Marcello, S. ; Michel, P. ; Mö, K. ; Morsch, H. P.FZJ* ; Pizzolotto, C. ; Plettner, C. ; Ritman, J.FZJ* ; Roderburg, E.FZJ* ; Schö, P. ; Schroeder, W. ; Schulte-Wissermann, M. ; Steinke, M. ; Sun, G. J. ; Ullrich, W. ; Wenzel, R. ; Wintz, P.FZJ* ; Wagner, M. ; Wilms, A. ; Wirth, S. ; Zupranski, P. ; COSY-TOF, C.

2007
North-Holland Publ. Amsterdam

Physics letters / B 647, (2007) [10.1016/j.physletb.2007.02.046]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10527 doi:10.1016/j.physletb.2007.02.046

Abstract: The reaction pp -> pp omega was investigated with the TOF spectrometer, which is an external experiment at the accelerator COSY (Forschungszentrum Julich, Germany). Total as well as differential cross sections were determined at an excess energy of 93 MeV (p(beam) = 2950 MeV/c). Using the total cross section of (9.0 +/- 0.7 +/- 1.1) mu b for the reaction pp -> pp omega determined here and existing data for the reaction pp -> pp phi, the ratio R-phi/omega = sigma(phi)/sigma(omega) turns out to be significantly larger than expected by the Okubo-Zweig-Iizuka (OZI) rule. The uncertainty of this ratio is considerably smaller than in previous determinations. The differential distributions show that the omega production is still dominated by S-wave production at this excess energy, however higher partial waves clearly contribute. A comparison of the measured angular distributions for omega production to published distributions for phi production at 83 MeV shows that the data are consistent with an identical production mechanism for both vector mesons. (c) 2007 Elsevier B.V. All rights reserved.

Keyword(s): p p: exclusive reaction ; vector meson: hadroproduction ; omega(783): hadronic decay ; Phi(1020) ; channel cross section ; angular distribution ; yield: ratio ; Iizuka-Okubo-Zweig rule: violation ; partial wave ; spectrometer: time-of-flight ; experimental results ; Juelich COSY PS ; p p --> 2p omega(783) ; omega(783) --> pi+ pi- pi0 ; 2.95 GeV/c ; vector meson production (auto) ; pp -> pp omega (auto) ; cross sections (auto) ; angular distributions (auto) ; OZI-violation (auto) ; strangeness of the nucleon (auto)