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  • First measurement of direct...
    Celentano, A.; Battaglieri, M.; De Vita, R.; Marsicano, L.; Mathieu, V.; Pilloni, A.; Adhikari, K. P.; Angelini, G.; Barion, L.; Bedlinskiy, I.; Benmokhtar, Fatiha; Bianconi, A.; Biselli, A. S.; Bossù, F.; Boiarinov, S.; Briscoe, W. J.; Brooks, W. K.; Burkert, V. D.; Carvajal, J. C.; Chetry, T.; Clark, L.; Cole, P. L.; Cortes, O.; Cruz-Torres, R.; D'Angelo, A.; Dashyan, N.; Djalali, C.; Dugger, M.; Egiyan, H.; Elouadrhiri, L.; Eugenio, P.; Fersch, R.; Filippi, A.; Gavalian, G.; Gevorgyan, N.; Girod, F. X.; Glazier, D. I.; Gohn, W.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Hafidi, K.; Hakobyan, H.; Hattawy, M.; Hauenstein, F.; Hayward, T. B.; Heddle, D.; Hicks, K.; Hobart, A.; Ilieva, Y.; Ireland, D. G.; Jenkins, D.; Joo, K.; Joosten, S.; Keller, D.; Khachatryan, M.; Khanal, A.; Kim, A.; Kim, C. W.; Kim, W.; Leali, M.; Lenisa, P.; Livingston, K.; Lucherini, V.; MacGregor, I. D.; Marchand, D.; Mascagna, V.; Meziani, Z. -E.; Munevar, E.; Neupane, K.; Osipenko, M.; Ostrovidov, A. I.; Paolone, M.; Pasyuk, E.; Phelps, W.; Pogorelko, O.; Prok, Y.; Ripani, M.; Ritman, J.; Rosner, G.; Rowley, J.; Sabatié, F.; Salgado, C.; Schumacher, R. A.; Sokan, D.; Soto, O.; Sparveris, N.; Stepanyan, S.; Strakovsky, I. I.; Tan, J. A.; Tyler, N.; Venturelli, L.; Voskanyan, H.; Watts, D.; Wei, X.; Wood, M. H.; Zachariou, N.; Zhang, J.; Zhao, Z. W.

    Physical review. C, 09/2020, Letnik: 102, Številka: 3
    Journal Article

    We present the first measurement of the reaction γp → a2(1320)0p in the photon energy range 3.5–5.5Ge V and four-momentum transfer squared 0.2 < –t < 2.0Ge V2. Data were collected with the CEBAF Large Acceptance Spectrometer detector at the Thomas Jefferson National Accelerator Facility. The a2 resonance was detected by measuring the reaction γp → π0ηp and reconstructing the π0η invariant mass. The most prominent feature of the differential cross section is a dip at –t ≈ 0.55GeV2. Here, this can be described in the framework of Regge phenomenology, where the exchange degeneracy hypothesis predicts a zero in the reaction amplitude for this value of the four-momentum transfer.