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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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author	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.
author_facet	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.
contents	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.
format	Preprint
id	arxiv_https___arxiv_org_abs_2504_21119
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Measurement of single- and double-polarization observables in the photoproduction of $π^+π^-$~meson pairs off the proton using CLAS at Jefferson Laboratory 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. Nuclear Experiment 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.
title	Measurement of single- and double-polarization observables in the photoproduction of $π^+π^-$~meson pairs off the proton using CLAS at Jefferson Laboratory
topic	Nuclear Experiment
url	https://arxiv.org/abs/2504.21119

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