Beam-helicity asymmetries in double-charged-pion photoproduction on the proton

Strauch, S. et al. (2005) Beam-helicity asymmetries in double-charged-pion photoproduction on the proton. Physical Review Letters, 95(16), p. 162003. (doi:10.1103/PhysRevLett.95.162003)

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Abstract

Beam-helicity asymmetries for the two-pion-photoproduction reaction γ⃗ p→pπ+π− have been studied for the first time in the resonance region for center-of-mass energies between 1.35 and 2.30 GeV. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer using circularly polarized tagged photons incident on an unpolarized hydrogen target. Beam-helicity-dependent angular distributions of the final-state particles were measured. The large cross-section asymmetries exhibit strong sensitivity to the kinematics and dynamics of the reaction. The data are compared with the results of various phenomenological model calculations, and show that these models currently do not provide an adequate description for the behavior of this new observable.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McKinnon, Dr Bryan and Livingston, Dr Kenneth and Protopopescu, Dr Dan and Ireland, Professor David and Kellie, Dr James and Rosner, Professor Guenther
Authors: Strauch, S., Berman, B., Adams, G., Ambrozewicz, P., Anghinolfi, M., Asavapibhop, B., Asryan, G., Audit, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J., Baltzell, N., Barrow, S., Batourine, V., Battaglieri, M., Beard, K., Bedlinskiy, I., Bektasoglu, M., Bellis, M., Benmouna, N., Bennhold, C., Biselli, A., Boiarinov, S., Bouchigny, S., Bradford, R., Branford, D., Briscoe, W., Brooks, W., Bultmann, S., Burkert, V., Butuceanu, C., Calarco, J., Careccia, S., Carman, D., Carnahan, B., Chen, S., Cole, P., Coleman, A., Coltharp, P., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., Cummings, J., Degtyarenko, P., Denizli, H., Dennis, L., De Sanctis, E., Deur, A., DeVita, R., Dharmawardane, K., Dhuga, K., Djalali, C., Dodge, G., Donnelly, J., Doughty, D., Dragovitsch, P., Dugger, M., Dytman, S., Dzyubak, O., Egiyan, H., Egiyan, K., Elouadrhiri, L., Empl, A., Eugenio, P., Fatemi, R., Fedotov, G., Feldman, G., Feuerbach, R., Fix, A., Forest, T., Funsten, H., Gavalian, G., Gilfoyle, G., Giovanetti, K., Girod, F., Goetz, J., Gothe, R., Griffioen, K., Guidal, M., Guler, N., Guo, L., Gyurjyan, V., Hadjidakis, C., Hakobyan, R., Hardie, J., Heddle, D., Hersman, F., Hicks, K., Hleiqawi, I., Holtrop, M., Hu, J., Huertas, M., Hyde-Wright, C., Ilieva, Y., Ireland, D., Ishkhanov, B., Ito, M., Jenkins, D., Jo, H., Joo, K., Juengst, H., Kellie, J., Khandaker, M., Kim, K., Kim, K., Kim, W., Klein, A., Klein, F., Klimenko, A., Klusman, M., Kossov, M., Kramer, L., Kubarovsky, V., Kuhn, J., Kuhn, S., Lachniet, J., Laget, J., Langheinrich, J., Lawrence, D., Lee, T., Lima, A., Livingston, K., Lukashin, K., Manak, J., Marchand, C., McAleer, S., McKinnon, B., McNabb, J., Mecking, B., Mestayer, M., Meyer, C., Mibe, T., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Mokeev, V., Morrow, S., Muccifora, V., Mueller, J., Mutchler, G., Nadel-Turonski, P., Napolitano, J., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B., Niyazov, R., Nozar, M., ORielly, G., Osipenko, M., Ostrovidov, A., Park, K., Pasyuk, E., Paterson, C., Philips, S., Pierce, J., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Pozdniakov, S., Preedom, B., Price, J., Prok, Y., Protopopescu, D., Qin, L., Raue, B., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B., Roberts, W., Ronchetti, F., Rosner, G., Rossi, P., Rowntree, D., Rubin, P., Sabatie, F., Salgado, C., Santoro, J., Sapunenko, V., Schumacher, R., Serov, V., Shafi, A., Sharabian, Y., Shaw, J., Skabelin, A., Smith, E., Smith, L., Sober, D., Stavinsky, A., Stepanyan, S., Stepanyan, S., Stokes, B., Stoler, P., Strakovsky, I., Suleiman, R., Taiuti, M., Taylor, S., Tedeschi, D., Thoma, U., Thompson, R., Tkabladze, A., Tkachenko, S., Todor, L., Tur, C., Ungaro, M., Vineyard, M., Vlassov, A., Wang, K., Weinstein, L., Weygand, D., Williams, M., Wolin, E., Wood, M., Yegneswaran, A., Yun, J., Zana, L., and Zhang, J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114
Published Online:10 October 2005

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