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  • First measurement of the he...
    Senderovich, I.; Dugger, M.; Ritchie, B.G.; Pasyuk, E.; Tucker, R.; Brock, J.; Carlin, C.; Meekins, D.G.; Seely, M.L.; Döring, M.; Collins, P.; Adhikari, K.P.; Akbar, Z.; Anefalos Pereira, S.; Badui, R.A.; Baltzell, N.A.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Biselli, A.S.; Boiarinov, S.; Carman, D.S.; Celentano, A.; Chandavar, S.; Cole, P.L.; Contalbrigo, M.; Cortes, O.; Credé, V.; D'Angelo, A.; De Vita, R.; De Sanctis, E.; Djalali, C.; Egiyan, H.; El Alaoui, A.; El Fassi, L.; Elouadrhiri, L.; Eugenio, P.; Fedotov, G.; Filippi, A.; Fleming, J.A.; Fradi, A.; Garillon, B.; Giovanetti, K.L.; Glazier, D.I.; Guidal, M.; Guo, L.; Hafidi, K.; Hanretty, C.; Hicks, K.; Holtrop, M.; Ilieva, Y.; Ishkhanov, B.S.; Jenkins, D.; Jiang, H.; Joosten, S.; Khachatryan, G.; Kim, A.; Klein, F.J.; Kubarovsky, V.; Lenisa, P.; Livingston, K.; Lu, H.Y.; McKinnon, B.; Meyer, C.A.; Mineeva, T.; Mokeev, V.; Montgomery, R.A.; Movsisyan, A.; Munoz Camacho, C.; Nadel-Turonski, P.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Park, S.; Peng, P.; Pisano, S.; Price, J.W.; Prok, Y.; Puckett, A.J.R.; Ripani, M.; Rizzo, A.; Rosner, G.; Sabatié, F.; Schott, D.; Schumacher, R.A.; Simonyan, A.; Skorodumina, Iu; Smith, G.D.; Sober, D.I.; Stepanyan, S.; Strakovsky, I.I.; Strauch, S.; Sytnik, V.; Tian, Ye; Voskanyan, H.; Voutier, E.; Wei, X.; Zana, L.; Zhang, J.; Zonta, I.

    Physics letters. B, 04/2016, Letnik: 755, Številka: C
    Journal Article

    Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction γ p → η p. 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 J\"ulich model to examine the case for the existence of a narrow Ν* 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 using that model. As a result, further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.