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Differential cross section measurements for gamma n --> pi- p above the first nucleon resonance region

By P. T. Mattione, D. S. Carman, I. I. Strakovsky, R. L. Workman, A. E. Kudryavtsev, A. Svarc, V. E. Tarasov, K. P. Adhikari, S. Adhikari, D. Adikaram, Z. Akbar, S. Anefalos Pereira, J. Ball, N. A. Baltzell, M. Bashkanov, M. Battaglieri, V. Batourine, I. Bedlinskiy, A. S. Biselli, S. Boiarinov, W. J. Briscoe, V. D. Burkert, T. Cao, A. Celentano, G. Charles, T. Chetry, G. Ciullo, L. Clark, P. L. Cole, M. Contalbrigo, O. Cortes, V. Crede, A. D'Angelo, N. Dashyan, R. De Vita, E. De Sanctis, M. Defurne, A. Deur, C. Djalali, M. Dugger, R. Dupre, H. Egiyan, A. El Alaoui, L. El Fassi, P. Eugenio, G. Fedotov, R. Fersch, A. Filippi, J. A. Fleming, A. Fradi, Y. Ghandilyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, C. Gleason, E. Golovatch, R. W. Gothe, K. A. Griffioen, M. Guidal, K. Hafidi, H. Hakobyan, C. Hanretty, N. Harrison, M. Hattawy, D. Heddle, K. Hicks, G. Hollis, M. Holtrop, S. M. Hughes, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, D. Jenkins, H. Jiang, H. S. Jo, K. Joo, S. Joosten, D. Keller, G. Khachatryan, M. Khachatryan, M. Khandaker, A. Kim, W. Kim, A. Klein, F. J. Klein, V. Kubarovsky, S. V. Kuleshov, L. Lanza, P. Lenisa, K. Livingston, I. J. D. Macgregor, N. Markov, B. Mckinnon, C. A. Meyer, Z. E. Meziani, T. Mineeva, V. Mokeev, R. A. Montgomery, A. Movsisyan, C. Munoz Camacho, G. Murdoch, P. Nadel-Turonski, L. A. Net, S. Niccolai, G. Niculescu, I. Niculescu, M. Osipenko, A. I. Ostrovidov, M. Paolone, R. Paremuzyan, K. Park, E. Pasyuk, W. Phelps, S. Pisano, O. Pogorelko, J. W. Price, S. Procureur, Y. Prok, D. Protopopescu, B. A. Raue, M. Ripani, B. G. Ritchie, A. Rizzo, G. Rosner, F. Sabatiã©, C. Salgado, R. A. Schumacher, Y. G. Sharabian, A. Simonyan, Iu. Skorodumina, G. D. Smith, D. Sokhan, N. Sparveris, I. Stankovic, S. Stepanyan, S. Strauch, M. Taiuti, M. Ungaro, H. Voskanyan, E. Voutier, N. K. Walford, D. Watts, X. Wei, M. H. Wood, N. Zachariou, J. Zhang and Z. W. Zhao

Abstract

The quasifree gamma d --> pi- -p(p) differential cross section has been measured with CLAS at photon beam energies E_(gamma) from 0.445 to 2.510 GeV (corresponding to W from 1.311 to 2.366 GeV) for pion center-of-mass angles cos(theta)_(pi)^(c.m). from -0.72 to 0.92. A correction for final state interactions has been applied to these data to extract the gamma n --> pi- -p differential cross sections. These cross sections are quoted in 8428 ( E_(gamma) ,theta)_(pi)^(c.m)) bins, a factor of nearly 3 increase in the world statistics for this channel in this kinematic range. These new data help to constrain coupled-channel analysis fits used to disentangle the spectrum of N* resonances and extract their properties. Selected photon decay amplitudes N* --> gamma n at the resonance poles are determined for the first time and are reported here

Topics: Nuclear and High Energy Physics, Lepton induced nuclear reactions, photon and charged-lepton interactions with Hadrons, Baryons
Year: 2017
DOI identifier: 10.1103/PhysRevC.96.035204
OAI identifier: oai:iris.unife.it:11392/2381226
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