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The European Physical Journal A

, Volume 44, Issue 1, pp 7–22 | Cite as

Systematic study of the pp \( \rightarrow\) pp\( \omega\) reaction

  • The COSY-TOF Collaboration
  • M. Abdel-Bary
  • S. Abdel-Samad
  • K. -Th. Brinkmann
  • H. Clement
  • J. Dietrich
  • E. Doroshkevich
  • S. Dshemuchadse
  • K. Ehrhardt
  • A. Erhardt
  • W. Eyrich
  • A. Filippi
  • H. Freiesleben
  • M. Fritsch
  • W. Gast
  • A. Gillitzer
  • J. Gottwald
  • H. Jäger
  • B. Jakob
  • R. Jäkel
  • L. Karsch
  • K. Kilian
  • H. Koch
  • M. Krapp
  • J. Kreß
  • E. Kuhlmann
  • A. Lehmann
  • S. Marcello
  • S. Mauro
  • P. Michel
  • K. Móller
  • H. P. Morsch
  • L. Naumann
  • N. Paul
  • C. Pizzolotto
  • Ch. Plettner
  • S. Reimann
  • M. Richter
  • J. Ritman
  • E. Roderburg
  • A. Schamlott
  • P. Schönmeier
  • W. Schroeder
  • M. Schulte-Wissermann
  • T. Sefzick
  • M. Steinke
  • G. Y. Sun
  • A. Teufel
  • W. Ullrich
  • G. J. Wagner
  • M. Wagner
  • R. Wenzel
  • A. Wilms
  • P. Wintz
  • P. Wüstner
  • P. Zupranski
Regular Article - Experimental Physics

Abstract

A systematic study of the production of \( \omega\) -mesons in proton-proton collisions was carried out in a kinematically complete experiment at three excess energies ( \( \varepsilon\) = 92, 128, 173 MeV). Both protons were detected using the large-acceptance COSY-TOF spectrometer at an external beam line at the Cooler Synchrotron COSY at Forschungszentrum Jülich. The total cross-section, angular distributions of both \( \omega\) -mesons and protons were measured and presented in various reference frames such as the overall CMS, helicity and Jackson frame. In addition, the orientation of the \( \omega\) -spin and invariant-mass spectra were determined. We observe \( \omega\) -production to take place dominantly in Ss and Sp final states at \( \varepsilon\) = 92, 128 MeV and, additionally, in Sd at \( \varepsilon\) = 173 MeV. No obvious indication of resonant \( \omega\) -production via N*-resonances was found, as proton angular distributions are almost isotropic and invariant-mass spectra are compatible with phase space distributions. A dominant role of 3 P 1 and 1 S 0 initial partial waves for \( \omega\) -production was concluded from the orientation of the decay plane of the \( \omega\) -meson. Although the Jackson angle distributions in the \( \omega\) p-Jackson frame are anisotropic we argue that this is not an indication of a resonance but rather a kinematical effect reflecting the anisotropy of the \( \omega\) angular distribution. The helicity angle distribution in the \( \omega\) p-helicity frame shows an anisotropy which probably reflects effects of the \( \omega\) angular momenta in the final state; this observable may be, in addition to the orientation of the \( \omega\) decay plane, the most sensitive one to judge the validity of theoretical descriptions of the production process.

Keywords

Angular Distribution Dalitz Plot Phase Space Distribution Helicity Angle Decay Plane 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • The COSY-TOF Collaboration
  • M. Abdel-Bary
    • 3
  • S. Abdel-Samad
    • 3
  • K. -Th. Brinkmann
    • 1
  • H. Clement
    • 4
  • J. Dietrich
    • 1
  • E. Doroshkevich
    • 4
  • S. Dshemuchadse
    • 1
  • K. Ehrhardt
    • 4
  • A. Erhardt
    • 4
  • W. Eyrich
    • 2
  • A. Filippi
    • 7
  • H. Freiesleben
    • 1
  • M. Fritsch
    • 2
  • W. Gast
    • 3
  • A. Gillitzer
    • 3
  • J. Gottwald
    • 1
  • H. Jäger
    • 3
  • B. Jakob
    • 1
  • R. Jäkel
    • 1
  • L. Karsch
    • 1
  • K. Kilian
    • 3
  • H. Koch
    • 8
  • M. Krapp
    • 2
  • J. Kreß
    • 4
  • E. Kuhlmann
    • 1
  • A. Lehmann
    • 2
  • S. Marcello
    • 7
  • S. Mauro
    • 8
  • P. Michel
    • 5
  • K. Móller
    • 5
  • H. P. Morsch
    • 3
    • 6
  • L. Naumann
    • 5
  • N. Paul
    • 3
  • C. Pizzolotto
    • 2
  • Ch. Plettner
    • 1
  • S. Reimann
    • 1
  • M. Richter
    • 1
  • J. Ritman
    • 3
  • E. Roderburg
    • 3
  • A. Schamlott
    • 5
  • P. Schönmeier
    • 1
  • W. Schroeder
    • 2
  • M. Schulte-Wissermann
    • 1
  • T. Sefzick
    • 3
  • M. Steinke
    • 8
  • G. Y. Sun
    • 1
  • A. Teufel
    • 2
  • W. Ullrich
    • 1
  • G. J. Wagner
    • 4
  • M. Wagner
    • 2
  • R. Wenzel
    • 1
  • A. Wilms
    • 8
  • P. Wintz
    • 3
  • P. Wüstner
    • 3
  • P. Zupranski
    • 6
  1. 1.Institut für Kern- und TeilchenphysikTechnische Universität DresdenDresdenGermany
  2. 2.Physikalisches InstitutUniversität Erlangen-NürnbergErlangenGermany
  3. 3.Institut für KernphysikForschungszentrum JülichJülichGermany
  4. 4.Physikalisches InstitutUniversität TübingenTübingenGermany
  5. 5.Institut für Kern- und HadronenphysikForschungszentrum Dresden-RossendorfDresdenGermany
  6. 6.Soltan Institute for Nuclear StudiesSwierk/OtwockPoland
  7. 7.INFN TorinoTorinoItaly
  8. 8.Institut für ExperimentalphysikRuhr-Universität BochumBochumGermany

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