Measurement of $ep \to e^{'}pπ^{+}π^{-}$: experimental procedures and baryon resonance analysis

Ripani, M.; Burkert, V. D.; Mokeev, V.; Battaglieri, M.; De Vita, R.; Golovach, E.; Taiuti, M.

Measurement of $ep \to e^{'}pπ^{+}π^{-}$: experimental procedures and baryon resonance analysis

Authors

Description

The cross section for the reaction $ e p \to e^{\prime} p π^{+} π^{-}$ was measured in the resonance region for 1.4$<$W$<$2.1 GeV and 0.5$<Q^{2}<$1.5 GeV$^{2}$/c$^{2}$ 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.
This preprint contains more detailed information on the analysis presented in hep-ex/0210054 and submitted to PRL