2π-PHOTOPRODUCTION from Clas and Cb-Elsa - the Search for Missing Resonances
Abstract
2π-photoproduction is one of the promising reactions to search for baryon resonances that have been predicted but have not yet been observed. The γp → pπ0π0 (CB-ELSA) and the γp → pπ+π- (CLAS) data show interesting resonance structures. A partial wave analysis (PWA) has to be done to determine which baryon resonances contribute, what their quantum numbers and their relative couplings to the different accessible p2π-channels and to the photon are. First preliminary PWA-results on the lowest energy pπ0π0 data (√ s < 1.8 {GeV}; ) look very promising. From an extension of this analysis to higher energies combining the pπ0π0 and the pπ+π--data, one can expect interesting results on resonances decaying into ∆π, Nρ, N(ππ)s, N*π, and Δ*π.
- Publication:
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NSTAR 2002
- Pub Date:
- July 2003
- DOI:
- Bibcode:
- 2003pen..conf...21T