Abstract.
The cross section for the reaction e p → e ′ p π + π - was measured in the resonance region for 1.4<W<2.1 GeV and 0.5<Q 2<1.5 GeV2/c2 using the CLAS detector at Jefferson Laboratory. The data show resonant structures not visible in previous experiments. The comparison of our data to a phenomenological prediction using available information on N * and Δ states shows an evident discrepancy. A better description of the data is obtained either by a sizeable change of the properties of the P 13(1720) resonance or by introducing a new baryon state, not reported in published analyses.
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Ripani, M. Baryon resonance analysis from two pion electroproduction at Jefferson Laboratory. Eur. Phys. J. A 19 (Suppl 1), 71–76 (2004). https://doi.org/10.1140/epjad/s2004-03-012-2
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DOI: https://doi.org/10.1140/epjad/s2004-03-012-2