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Main Authors:	Roy, P., Cao, S., Crede, V., Klempt, E., Nikonov, V. A., Sarantsev, A. V., Burkert, V. D., Mokeev, V., Achenbach, P., Alvarado, J. S., Armstrong, W. R., Atac, H., Avakian, H., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bondi, M., Bossu, F., Boiarinov, S., Brinkmann, K. -T., Briscoe, W. J., Brooks, W. K., Cao, T., Capobianco, R., Carman, D. S., Chatagnon, P., Ciullo, G., Cole, P. L., Contalbrigo, M., D'Angelo, A., Dashyan, N., DeVita, R., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Eugenio, P., Fegan, S., Fernando, I. P., Filippi, A., Gavalian, G., Gothe, R. W., Guo, L., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Hobart, A., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jenkins, D., Jiang, H., Jo, H. S., Joo, K., Joosten, S., Keller, D., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Klimenko, V., Kripko, A., Kubarovsky, V., Lanza, L., Lenisa, P., Li, X., Livingston, K., MacGregor, I. J. D., Marchand, D., Martiryan, D., Mascagna, V., Matamoros, D., McCracken, M. E., McKinnon, B., Mineeva, T., Camacho, C. Munoz, Nadel-Turonski, P., Neupane, K., Nguyen, D., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Ouillon, M., Pandey, P., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Paul, S. J., Phelps, W., Pilleux, N., Rafael, S. Polcher, Price, J., Prok, Y., Protopopescu, D., Richards, J., Ripani, M., Ritchie, B., Ritman, J., Rosner, G., Rossi, P., Rusova, A. A., Salgado, C., Schadmand, S., Schmidt, A., Schumacher, R. A., Sharabian, Y. G., Shirokov, E. V., Shrestha, S., Sokhan, D., Sparveris, N., Spreafico, M., Strakovsky, I. I., Strauch, S., Tan, J. A., Tenorio, M., Trotta, N., Tyson, R., Ungaro, M., Vallarino, S., Venturelli, L., Vittorini, T., Voskanyan, H., Voutier, E., Watts, D. P., Weerasinghe, U., Wei, X., Wood, M. H., Xu, L., Zachariou, N., Zhao, Z. W., Zurek, M.
Format:	Preprint
Published:	2025
Subjects:	Nuclear Experiment
Online Access:	https://arxiv.org/abs/2504.21119
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The photoproduction of $π^+π^-$ meson pairs off the proton has been studied in the reaction $γp\to p\,π^+π^-$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the beam and target asymmetries, $I^{s,c}$ and $P_{x,y}$, have been measured along with the beam-target double-polarization observables, $P^{s,c}_{x,y}$, using a transversely polarized target with center-of-mass energies ranging from 1.51 GeV up to 2.04 GeV. These data and additional $ππ$ photoproduction observables from CLAS and experiments elsewhere were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from $s$-channel resonance production are observed in addition to $t$-channel exchange processes. The data indicate significant contributions from $N^\ast$ and $Δ^\ast$ resonances in the third and fourth resonance regions.

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