First measurement of the helicity dependence for the gamma p -> p pi(+)pi(-) reaction
2007 | journal article. A publication with affiliation to the University of Göttingen.
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First measurement of the helicity dependence for the gamma p -> p pi(+)pi(-) reaction
Ahrens, J.; Altieri, S.; Annand, J. R. M.; Arends, H.-J.; Beck, R.; Blackston, M. A. & Bradtke, C. et al. (2007)
The European Physical Journal A, 34(1) pp. 11-21. DOI: https://doi.org/10.1140/epja/i2007-10491-5
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Details
- Authors
- Ahrens, J.; Altieri, S.; Annand, J. R. M.; Arends, H.-J.; Beck, R.; Blackston, M. A.; Bradtke, C.; Braghieri, A.; d'Hose, N.; Dutz, H.; Fix, A.; Goertz, S.; Grabmayr, P.; Hasegawa, S.; Heid, E.; Holvoet, H.; Horikawa, N.; Iwata, T.; Jahn, Olaf; Jennewein, P.; Klein, F.; Kondratiev, R.; Lang, M.; Lannoy, B.; Lisin, V.; Martinez-Fabregate, M.; McGeorge, J. C.; Meyer, Werner; Panzeri, A.; Pedroni, P.; Pinelli, T.; Preobrajenski, I.; Reicherz, G.; Rohlof, Ch.; Rosner, G.; Rost, M.; Rostomyan, T.; Ryckbosch, D.; Schumacher, M.; Seitz, Bjoern; Tamas, Gabor; Thomas, Andy; de Vyver, R. van; Weller, H. R.; Zapadtka, F.
- Abstract
- The helicity dependence of the total cross-section and the invariant-mass distributions in the (p pi(+/-)) and (pi(+) pi(-)) final states for the gamma p -> p pi(+)pi(-) reaction have been measured for the first time at incident photon energies from 400 to 800MeV. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. Although this channel is found to be predominantly excited by the intermediate production of a Delta pi state, both the measured unpolarized and the helicity-dependent observables are generally not well described by the existing theoretical models.
- Issue Date
- 2007
- Status
- published
- Publisher
- Springer
- Journal
- The European Physical Journal A
- ISSN
- 1434-6001
