The search for a π₁(1400) exotic meson in the γ p→Δ⁺⁺ηπ^- system with clas

Several experiments have reported evidence for the π₁(1400) using pion production but the results have been controversial and its existence has yet to be seen in photoproduction. Theoretical works have implied that the production amplitude will be greatly increased in photoproduction in comparison to the pion production. The reaction γ p→Δ⁺⁺X → pπ⁺π^-(η) is being studied in the photon energy range 4.4 to 5.4 GeV as a possible method of producing the p1(1400) resonance. Data were collected at Jefferson Lab in Hall B. This reaction is being investigated by detecting the pπ⁺π^-2γ and reconstructing the η through the missing-mass of the pπ⁺π ^-, and comparing the results to the 2g composite. These data have yielded a₀(980) and a2(1320) in the π^-η invariant mass spectrum. Further analysis is needed to untangle the possible π₁(1400) resonance from the a₂(1320).