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First results on nucleon resonance photocouplings from the gamma p -> pi(+)pi(-) p reaction

Author:
Golovatch, E.  Burkert, V. D.  Carman, D. S.  Gothe, R. W.  Hicks, K.  Ishkhanov, B. S.  Mokeev, V. I.  Pasyuk, E.  Adhikari, S.  Akbar, Z.  Amaryan, M. J.  Avakian, H.  Ball, J.  Barion, L.  Bashkanov, M.  Battaglieri, M.  Bedlinskiy, I.  Biselli, A. S.  Boiarinov, S.  Briscoe, W. J.  Cao, F.  Celentano, A.  Chatagnon, P.  Chetry, T.  Ciullo, G.  Clark, L.  Clary, B. A.  Cole, P. L.  Contalbrigo, M.  Crede, V.  D'Angelo, A.  Dashyan, N.  DeVita, R.  DeSanctis, E.  Defurne, M.  Deur, A.  Diehl, S.  Djalali, C.  Dugger, M.  Dupre, R.  Egiyan, H.  Ehrhart, M.  ElAlaoui, A.  ElFassi, L.  Elouadrhiri, L.  Eugenio, P.  Fedotov, G.  Fersch, R.  Filippi, A.  Ghandilyan, Y.  Gilfoyle, G. P.  Giovanetti, K. L.  Girod, F. X.  Glazier, D. I.  Griffioen, K. A.  Guidal, M.  Guo, L.  Hafidi, K.  Hakobyan, H.  Harrison, N.  Hattawy, M.  Heddle, D.  Holtrop, M.  Ilieva, Y.  Ireland, D. G.  Isupov, E. L.  Jenkins, D.  Jo, H. S.  Johnston, S.  Joo, K.  Kabir, M. L.  Keller, D.  Khachatryan, G.  Khachatryan, M.  Khandaker, M.  Kim, W.  Klein, A.  Klein, F. J.  Kubarovsky, V.  Lanza, L.  Lenisa, P.  Livingston, K.  MacGregor, I. J. D.  Marchand, D.  Markov, N.  McKinnon, B.  Meyer, C. A.  Montgomery, R. A.  Movsisyan, A.  Munoz Camacho, C.  Nadel-Turonski, P.  Niccolai, S.  Niculescu, G.  Osipenko, M.  Ostrovidov, A. I.  Paolone, M.  Paremuzyan, R.  Park, K.  Pogorelko, O.  Price, J. W.  Prok, Y.  Protopopescu, D.  Ripani, M.  Riser, D.  Rizzo, A.  Rosner, G.  Sabatie, F.  Salgado, C.  Schumacher, R. A.  Sharabian, Y. G.  Skorodumina, Iu.  Smith, G. D.  Sober, D. I.  Sokhan, D.  Sparveris, N.  Strakovsky, I. I.  Strauch, S.  Taiuti, M.  Tan, J. A.  Tyler, N.  Ungaro, M.  Voskanyan, H.  Voutier, E.  Wang, R.  Wei, X.  Wood, M. H.  Zachariou, N.  Zhang, J.  Zhao, Z. W.  


Journal:
PHYSICS LETTERS B


Issue Date:
2019


Abstract(summary):

We report the first experimental measurements of the nine 1-fold differential cross sections for the gamma p ->pi(+)pi(-) p reaction, obtained with the CLAS detector at Jefferson Laboratory. The measurements cover the invariant mass range of the final state hadrons from 1.6 GeV < W < 2.0 GeV. For the first time the photocouplings of all prominent nucleon resonances in this mass range have been extracted from this exclusive channel. Photoproduction of two charged pions is of particular importance for the evaluation of the photocouplings for the Delta(1620)1/2(-) , Delta(1700)3/2(-) , N(1720)3/2(+), and Delta(1905)5/2(+) resonances, which have dominant decays into the pi pi N final states rather than the more extensively studied single meson decay channels. (C) 2018 The Author. Published by Elsevier B.V.


Page:
371---379


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