Simultaneous Photoproduction of eta and pi0 Mesons on the Proton

Döring, M.; Randieri, C.; Sandri, P. L.; Fantini, A.; Hourany, E.; Lapik, A.; Turinge, A.; Sperduto, M.; Ghio, F.; Gervino, G.; Nedorezov, V.; Di Salvo, R.; Sutera, M.; Russo, G.; Didelez, J. P.; Rudnev, N.; Kunne, R.; Bouchigny, S.; Castoldi, M.; Fichen, L.; Moricciani, D.; Giusa, A.; Assafiri, Y.; Muskarenkov, A.; D`Angelo, A.; Girolami, B.; Bartalini, O.; Ajaka, J.; Bellini, V.; Oset, E.; Schaerf, C.; Guidal, M.

doi:10.1103/PhysRevLett.100.052003

Journal Article

Simultaneous Photoproduction of eta and pi0 Mesons on the Proton

Döring, M.FZJ* ; Ajaka, J. ; Assafiri, Y. ; Bartalini, O. ; Bellini, V. ; Bouchigny, S. ; Castoldi, M. ; D`Angelo, A. ; Didelez, J. P. ; Di Salvo, R. ; Fantini, A. ; Fichen, L. ; Gervino, G. ; Ghio, F. ; Girolami, B. ; Giusa, A. ; Guidal, M. ; Hourany, E. ; Kunne, R. ; Lapik, A. ; Sandri, P. L. ; Moricciani, D. ; Muskarenkov, A. ; Nedorezov, V. ; Oset, E. ; Randieri, C. ; Rudnev, N. ; Russo, G. ; Schaerf, C. ; Sperduto, M. ; Sutera, M. ; Turinge, A.

2008
APS College Park, Md.

Physical review letters 100, 052003 (2008) [10.1103/PhysRevLett.100.052003]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7189 doi:10.1103/PhysRevLett.100.052003

Abstract: The analysis of the gamma p ->eta pi(0)p reaction has been performed using data from the GRAAL experiment. The total and differential cross sections and the beam asymmetry have been obtained from threshold up to 1.5 GeV of beam energy. The two resonances S-11(1535) and Delta(1700) are expected to be excited in the intermediate states of this reaction. The results are used to test predictions based on the assumption that both resonances are dynamically generated from the meson-baryon interaction provided by chiral Lagrangians. The term involving the Delta(1700) excitation, followed by the decay into eta Delta(1232), is found to be dominant.

Keyword(s): effective Lagrangian: chiral ; photon p: interaction ; photon: polarized beam ; eta: photoproduction ; pi0: associated production ; nucleon resonance: intermediate boson ; N(1535) ; Delta(1700) ; cross section ; polarization: asymmetry ; energy dependence ; numerical calculations ; interpretation of experiments: Grenoble ESRF ; photon p --> p eta pi0 ; < 1.5 GeV: (1))