First measurement of the helicity asymmetry E in η photoproduction on the proton

Senderovich, I. et al. (2016) First measurement of the helicity asymmetry E in η photoproduction on the proton. Physics Letters B, 755, pp. 64-69. (doi: 10.1016/j.physletb.2016.01.044)

Abstract

Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction γp→ηp. Data were obtained using the FROzen Spin Target (FROST) with the CLAS spectrometer in Hall B at Jefferson Lab, covering a range of center-of-mass energy W from threshold to 2.15 GeV and a large range in center-of-mass polar angle. As an initial application of these data, the results have been incorporated into the Jülich–Bonn model to examine the case for the existence of a narrow N⁎ resonance between 1.66 and 1.70 GeV. The addition of these data to the world database results in marked changes in the predictions for the E observable from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.

• Item Type: Articles
• Keywords: Eta photoproduction, polarization observable, helicity asymmetry.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Glazier, Dr Derek and MacGregor, Professor Douglas and McKinnon, Dr Bryan and Livingston, Dr Kenneth and Montgomery, Dr Rachel and Ireland, Professor David and Rosner, Professor Guenther
• Authors: Senderovich, I., Morrison, B.T., Dugger, M., Ritchie, B.G., Pasyuk, E., Tucker, R., Brock, J., Carlin, C., Keith, C.D., Meekins, D.G., Seely, M.L., Rönchen, D., Döring, M., Collins, P., Adhikari, K.P., Adikaram, D., Akbar, Z., Anderson, M., Anefalos Pereira, S., Badui, R.A., Ball, J., Baltzell, N.A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Colaneri, L., Cole, P.L., Contalbrigo, M., Cortes, O., Credé, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fleming, J.A., Fradi, A., Garillon, B., Ghandilyan, Y., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Goetz, J.T., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Hughes, S.M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Jenkins, D., Jiang, H., Jo, H.S., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Klein, F.J., Kubarovsky, V., Kunkel, M.C., Lenisa, P., Livingston, K., Lu, H.Y., MacGregor, I.J.D., Mattione, P., McKinnon, B., Meyer, C.A., Mineeva, T., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Net, L.A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Park, K., Park, S., Peng, P., Phelps, W., Pisano, S., Pogorelko, O., Price, J.W., Prok, Y., Puckett, A.J.R., Ripani, M., Rizzo, A., Rosner, G., Roy, P., Sabatié, F., Salgado, C., Schott, D., Schumacher, R.A., Seder, E., Simonyan, A., Skorodumina, I., Smith, G.D., Sober, D.I., Sparveris, N., Stepanyan, S., Stoler, P., Strakovsky, I.I., Strauch, S., Sytnik, V., Tian, Y., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., 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
• Publisher: Elsevier
• ISSN: 0370-2693
• ISSN (Online): 1873-2445
• Published Online: 26 January 2016
• Copyright Holders: Copyright © 2016 Elsevier B.V.
• First Published: First published in Physics Letters B 775:64-69
• Publisher Policy: Reproduced under a Creative Commons License
• Data DOI: 10.1016/j.physletb.2016.01.044