First results on nucleon resonance photocouplings from the γp → π+π−p reaction

/ Authors

C. C. E. Golovatch, V. Burkert, D. Carman, R. Gothe, K. Hicks, B. Ishkhanov, V. Mokeev, E. Pasyuk, S. Adhikari, Z. Akbar

and 119 more authors

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

/ Abstract

Abstract We report the first experimental measurements of the nine 1-fold differential cross sections for the γ p → π + π − 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 Δ ( 1620 ) 1 / 2 − , Δ ( 1700 ) 3 / 2 − , N ( 1720 ) 3 / 2 + , and Δ ( 1905 ) 5 / 2 + resonances, which have dominant decays into the ππN final states rather than the more extensively studied single meson decay channels.

Journal: Physics Letters B

DOI: 10.1016/j.physletb.2018.10.013