2-pi Photoproduction from CLAS and CB-ELSA - The Search for Missing Resonances

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2-pi-photoproduction is one of the promising reactions to search for baryon resonances that have been predicted but have not yet been observed. The gamma-rho --> rho-pi{sup 0}-pi{sup 0}(CB-ELSA) and the gamma-rho --> rho-pi{sup +}-pi{sup -} (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 rho-2-pi-channels and to the photon are. First preliminary PWA-results on the lowest energy rho-pi{sup 0}-pi{sup 0} data (sq rt s<1.8 GeV)look very promising. From an extension of this analysis to higher energies … continued below

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Thoma, Ulrike October 1, 2003.

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2-pi-photoproduction is one of the promising reactions to search for baryon resonances that have been predicted but have not yet been observed. The gamma-rho --> rho-pi{sup 0}-pi{sup 0}(CB-ELSA) and the gamma-rho --> rho-pi{sup +}-pi{sup -} (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 rho-2-pi-channels and to the photon are. First preliminary PWA-results on the lowest energy rho-pi{sup 0}-pi{sup 0} data (sq rt s<1.8 GeV)look very promising. From an extension of this analysis to higher energies combining the rho-pi{sup 0}-pi{sup 0} and the rho-pi{sup +}-pi{sup -}-data, one can expect; interesting results on resonances decaying into Delta-pi, N-rho, N(pi-pi)s, N*-pi, and Delta*-pi.

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399 Kilobytes pages

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  • NSTAR 2002 Workshop On The Physics Of Excited Nucleons, Pittsburgh, PA (US), 10/09/2002--10/12/2002

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  • Report No.: JLAB-PHY-03-02
  • Report No.: DOE/ER/40150-2427
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 807813
  • Archival Resource Key: ark:/67531/metadc739345

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  • October 1, 2003

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Thoma, Ulrike. 2-pi Photoproduction from CLAS and CB-ELSA - The Search for Missing Resonances, article, October 1, 2003; Newport News, Virginia. (https://digital.library.unt.edu/ark:/67531/metadc739345/: accessed December 6, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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