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A search for exotic mesons in the $\pi^{+}\pi^{+}\pi^{-}$ systemphotoproduced by the charge exchange reaction $\gamma p\to\pi^{+}\pi^{+}\pi^{-}(n)$ was carried out by the CLAS collaboration atJefferson Lab. A tagged-photon beam with energies in the 4.8 to 5.4 GeV range,produced through bremsstrahlung from a 5.744 GeV electron beam, was incident ona liquid-hydrogen target. A Partial Wave Analysis (PWA) was performed on asample of 83,000 events, the highest such statistics to date in this reactionat these energies. The main objective of this study was to look for thephotoproduction of an exotic $J^{PC} = 1^{-+}$ resonant state in the 1 to 2 GeVmass range. Our PWA analysis, based on the isobar model, shows production ofthe $a_{2}(1320)$ and the $\pi_{2}(1670)$ mesons, but no evidence for the$a_{1}(1260)$, nor the $\pi_{1}(1600)$ exotic state at the expected levels. Anupper limit of 13.5 nb is determined for the exotic $\pi_1(1600)$ crosssection, less than 2% of the $a_2(1320)$ production.

Search for the photo-excitation of exotic mesons in the pi+pi+pi- system