| Title: |
Systematic study of the pp -> pp omega reaction |
| Authors: |
TOF Collaboration; Abdel-Bary, M.; Abdel-Samad, S.; Brinkmann, K. -Th.; Clement, H.; Dietrich, J.; Doroshkevich, E.; Dshemuchadse, S.; Ehrhardt, K.; Erhardt, A.; Eyrich, W.; Filippi, A.; Freiesleben, H.; Fritsch, M.; Gast, W.; Gillitzer, A.; Gottwald, J.; Jäger, H.; Jakob, B.; Jäkel, R.; Karsch, L.; Kilian, K.; Koch, H.; Krapp, M.; Kreß, J.; Kuhlmann, E.; Lehmann, A.; Marcello, S.; Mauro, S.; Michel, P.; Möller, K.; Morsch, H. P.; Naumann, L.; Paul, N.; Pizzolotto, C.; Plettner, Ch.; Reimann, S.; Richter, M.; Ritman, J.; Roderburg, E.; Schamlott, A.; Schönmeier, P.; Schroeder, W.; Schulte-Wissermann, M.; Sefzick, T.; Steinke, M.; Sun, G. Y.; Teufel, A.; Ullrich, W.; Wagner, G. J.; Wagner, M.; Wenzel, R.; Wilms, A.; Wintz, P.; Wüstner, P.; Zupranski, P. |
| Publication Year: |
2010 |
| Collection: |
ArXiv.org (Cornell University Library) |
| Subject Terms: |
Nuclear Experiment |
| Description: |
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(epsilon= 92, 128, 173MeV). 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 epsilon = 92, 128 MeV and, additionally, in Sd at epsilon= 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 ^3P_1 and ^1S_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. ; 17 pages, 16 figures, accepted for publication in EPJA |
| Document Type: |
text |
| Language: |
unknown |
| Relation: |
http://arxiv.org/abs/1001.3043 |
| DOI: |
10.1140/epja/i2010-10924-0 |
| Availability: |
http://arxiv.org/abs/1001.3043; https://doi.org/10.1140/epja/i2010-10924-0 |
| Accession Number: |
edsbas.5BB4B0C7 |
| Database: |
BASE |