| Title: |
Systematic study of the pp to pp omega reaction |
| Authors: |
Abdel-Bary, M.; AbdEl-Samad, S.; Fanara, C.; Filges, D.; Filippi, A.; Freiesleben, H.; Fritsch, M.; Gast, W.; Georgi, J.; Gillitzer, A.; Gottwald, J.; Hesselbarth, D.; Brinkmann, K.; Jaeger, H.; Jakob, B.; Jaekel, R.; Karsch, L.; Kilian, K.; Koch, H.; Krapp, M.; Kress, J.; Kuhlmann, E.; Lehmann, A.; Clement, H.; Marcello, S.; Marwinski, S.; Mauro, S.; Meyer, W.; Michel, P.; Moeller, K.; Moertel, H.; Morsch, H.P.; Naumann, L.; Paul, N.; Dietrich, J.; Pinna, L.; Pizzolotto, C.; Plettner, C.; Reimann, S.; Richter, M.; Ritman, J.; Roderburg, E.; Schamlott, A.; Schoenmeier, P; Schulte-Wissermann, M.; Dorochkevitch, E.; Schroeder, W.; Sefzick, T.; Steinke, M.; Stinzing, F.; Sun, G.; Teufel, A.; Ullrich, W.; Waechter, J.; Wagner, G. J.; Wagner, M.; Dshemuchadse, S.; Wenzel, R.; Wilms, A.; Wintz, P.; Wirth, S.; Wuestner, P.; Zupranski, P.; Ehrhardt, K.; Erhardt, A.; Eyrich, W. |
| Source: |
The European physical journal / A 44, 7 - 22 (2010). doi:10.1140/epja/i2010-10924-0 |
| Publisher Information: |
Springer |
| Publication Year: |
2010 |
| Collection: |
Forschungszentrum Jülich: JuSER (Juelich Shared Electronic Resources) |
| Subject Terms: |
info:eu-repo/classification/ddc/530; p p: interaction; omega(783): hadroproduction; total cross section: energy dependence; p: angular distribution; meson: production; meson: spin; meson: model; COSY-TOF; Juelich COSY PS; p p --> p p omega(783) |
| Subject Geographic: |
DE |
| 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 Julich. 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, 128MeV and, additionally, in Sd at epsilon = 173MeV. 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 P-3(1) and S-1(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. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| ISSN: |
1434-6001 |
| Relation: |
info:eu-repo/semantics/altIdentifier/hdl/2128/10325; info:eu-repo/semantics/altIdentifier/arxiv/arXiv:oai:arXiv.org:1001.3043; info:eu-repo/semantics/altIdentifier/issn/1434-6001; info:eu-repo/semantics/altIdentifier/arxiv/arXiv:1001.3043; info:eu-repo/semantics/altIdentifier/wos/WOS:000276438700002 |
| Availability: |
https://juser.fz-juelich.de/record/12753; https://juser.fz-juelich.de/search?p=id:%22PreJuSER-12753%22 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.FC29CE21 |
| Database: |
BASE |