First measurement of the polarization observable E in the p→(γ→,π+)n reaction up to 2.25 GeV

Strauch, S. et al. (2015) First measurement of the polarization observable E in the p→(γ→,π+)n reaction up to 2.25 GeV. Physics Letters B, 750, pp. 53-58. (doi: 10.1016/j.physletb.2015.08.053)

Abstract

First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E , for the reaction View the MathML source, has been measured using a circularly polarized tagged-photon beam, with energies from 0.35 to 2.37 GeV. The final-state pions were detected with the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson National Accelerator Facility. These polarization data agree fairly well with previous partial-wave analyses at low photon energies. Over much of the covered energy range, however, significant deviations are observed, particularly in the high-energy region where high-L multipoles contribute. The data have been included in new multipole analyses resulting in updated nucleon resonance parameters. We report updated fits from the Bonn–Gatchina, Jülich–Bonn, and SAID groups.

• Item Type: Articles
• Keywords: Baryon spectroscopy, Pion photoproduction, Polarization observables, FROST experiment.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Sokhan, Dr Daria and McKinnon, Dr Bryan and Ireland, Professor David and Livingston, Dr Kenneth and MacGregor, Professor Douglas and Fegan, Mr Stuart and Montgomery, Dr Rachel and Glazier, Dr Derek and Rosner, Professor Guenther and Protopopescu, Dr Dan
• Authors: Strauch, S., Briscoe, W.J., Doring, M., Klempt, E., Nikonov, V.A., Pasyuk, E., Ronchen, D., Sarantsev, A.V., Strakovsky, I., Workman, R., Adhikari, K.P., Adikaram, D., Anderson, M.D., Anefalos Periera, S., Anisovich, A.V., Badui, R.A., Ball, J., Batourine, V., Battaglieri, M., Bedlinskiy, I., Benmouna, N., Biselli, A.S., Brock, J., Brooks, W.K., Burkert, V.D., Cao, T., Carlin, C., Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Colerani, L., Cole, P.L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., Dasjyan, N., D'Angelo, A., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fleming, J.A., Forest, T.A., Fradi, A., Gevorgyna, N., Ghandilyan, Y., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Hughes, S.M., Ilyeva, Y., Ireland, D.G., Ishkanov, B.S., Isupov, E.L., Jenkins, D., Jiang, H., Jo, H.S., Joo, K., Joosten, S., Keith, C.D., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., Kuhn, S.E., Lenisa, P., Livingston, K., Lu, H.Y., MacGregor, I.J.D., Markov, N., McKinnon, B., Meekins, D.G., Meyer, C.A., Mokeev, V., Montgomery, R.A., Moody, C.I., Moutarde, H., Movsisyan, A., Munevar, E., Munoz Camacho, C., Badel-Turonski, P., Net, L.A., Niccolai, S., Niculescu, G., Niculescu, I., O'Reilley, G., Osipenko, M., Ostrovidov, A.I., Park, K., Peng, P., Phelps, W., Phillips, J.J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A.J.R., Raue, B.A., Ripani, M., Ritchie, B.G., Rizzo, A., Rosner, G., Roy, P., Sabatie, F., Salgado, C., Schott, D., Schumacher, R.A., Seder, E., Seely, M.L., Senderovich, I., Sharabian, Y.G., Simonyan, A., Skorodumina, I., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stoler, P., Stepanyan, S., Sytnik, V., Taiuti, M., Tian, Y., Trivedi, A., Tucker, R., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Wood, M.H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z.W., and Zonta, I.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Research Group: Nuclear Physics
• Journal Name: Physics Letters B
• Journal Abbr.: PLB
• Publisher: Elsevier
• ISSN: 0370-2693
• ISSN (Online): 1873-2445
• Published Online: 28 August 2015
• Copyright Holders: Copyright © 2016 Elsevier B.V.
• First Published: First published in Physics Letters B 750: 53-58
• Publisher Policy: Reproduced under a Creative Commons License