Partial wave analysis of the reaction γp→pω and the search for nucleon resonances

Williams, M. et al. (2009) Partial wave analysis of the reaction γp→pω and the search for nucleon resonances. Physical Review C, 80(6), 065209. (doi: 10.1103/PhysRevC.80.065209)

Abstract

An event-based partial wave analysis (PWA) of the reaction γp→pω has been performed on a high-statistics dataset obtained using the CLAS at Jefferson Lab for center-of-mass energies from threshold up to 2.4 GeV. This analysis benefits from access to the world’s first high-precision spin-density matrix element measurements, available to the event-based PWA through the decay distribution of ω→π+π−π⁰. The data confirm the dominance of the t-channel π⁰ exchange amplitude in the forward direction. The dominant resonance contributions are consistent with the previously identified states F₁₅(1680) and D₁₃(1700) near threshold, as well as the G₁₇(2190) at higher energies. Suggestive evidence for the presence of a J^P=5/2⁺ state around 2 GeV, a “missing” state, has also been found. Evidence for other states is inconclusive.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Sokhan, Dr Daria and Fegan, Mr Stuart and Watts, Dr Daniel and Protopopescu, Dr Dan and McKinnon, Dr Bryan and Livingston, Dr Kenneth and Ireland, Professor David and Hassall, Mr Neil and Rosner, Professor Guenther and Johnstone, Mr John
• Authors: Williams, M., Applegate, D., Bellis, M., Meyer, C., Adhikari, K., Anghinolfi, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Bedlinskiy, I., Berman, B., Biselli, A., Briscoe, W., Brooks, W., Burkert, V., Careccia, S., Carman, D., Cole, P., Collins, P., Crede, V., D'Angelo, A., Daniel, A., De Vita, R., De Sanctis, E., Deur, A., Dey, B., Dhamija, S., Dickson, R., Djalali, C., Dodge, G., Doughty, D., Dugger, M., Dupre, R., El Alaoui, A., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fradi, A., Gabrielyan, M., Garcon, M., Gilfoyle, G., Giovanetti, K., Girod, F., Gohn, W., Golovatch, E., Gothe, R., Griffioen, K., Guidal, M., Guler, N., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hassall, N., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D., Ishkhanov, B., Isupov, E., Jawalkar, S., Jo, H., Johnstone, J., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, W., Klein, A., Klein, F., Krahn, Z., Kubarovsky, V., Kuleshov, S., Kuznetsov, V., Livingston, K., Lu, H., Mayer, M., McAndrew, J., McCracken, M., McKinnon, B., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Munevar, E., Nadel-Turonski, P., Nepali, C., Niccolai, S., Niculescu, G., Niculescu, I., Niroula, M., Niyazov, R., Osipenko, M., Ostrovidov, A., Paris, M., Park, K., Park, S., Pasyuk, E., Pereira, S., Perrin, Y., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J., Procureur, S., Protopopescu, D., Ricco, G., Ripani, M., Ritchie, B., Rosner, G., Rossi, P., Sabatie, F., Saini, M., Salamanca, J., Salgado, C., Schott, D., Schumacher, R., Seraydaryan, H., Sharabian, Y., Smith, E., Sober, D., Sokhan, D., Stepanyan, S., Stoler, P., Strakovsky, I., Strauch, S., Taiuti, M., Tedeschi, D., Tkachenko, S., Ungaro, M., Vineyard, M., Voutier, E., Watts, D., Weygand, D., Wood, M., Zhang, J., and Zhao, B.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review C
• Publisher: American Physical Society
• ISSN: 0556-2813
• ISSN (Online): 1089-490X
• Published Online: 30 December 2009