Beam–target helicity asymmetry E in K+Σ− photoproduction on the neutron

Zachariou, N; Watts, Dp; Fleming, J; Sarantsev, Av; Nikonov, Va; D'Angelo, A; Bashkanov, M; Hanretty, C; Kageya, T; Klein, Fj; Lowry, M; Lu, H; Sandorfi, A; Wei, X; Zonta, I; Adhikari, Kp; Adhikari, S; Amaryan, Mj; Angelini, G; Asryan, G; Atac, H; Barion, L; Bass, C; Battaglieri, M; Bedlinskiy, I; Benmokhtar, F; Bianconi, A; Biselli, As; Bossu, F; Boiarinov, S; Briscoe, Wj; Brooks, Wk; Bulumulla, D; Burkert, V; Carman, Ds; Carvajal, Jc; Celentano, A; Charles, G; Chatagnon, P; Chetry, T; Ciullo, G; Cole, Pl; Contalbrigo, M; Dashyan, N; De Vita, R; Deur, A; Diehl, S; Djalali, C; Dupre, R; Egiyan, H; Ehrhart, M; El Alaoui, A; Eugenio, P; Fegan, S; Fersch, R; Filippi, A; Gavalian, G; Gevorgyan, N; Ghandilyan, Y; Gilfoyle, Gp; Girod, Fx; Gohn, W; Golovatch, E; Gothe, Rw; Griffioen, Ka; Guidal, M; Hafidi, K; Hakobyan, H; Hattawy, M; Heddle, D; Hicks, K; Ho, D; Holtrop, M; Ilieva, Y; Ireland, Dg; Ishkhanov, Bs; Isupov, El; Jenkins, D; H. S., J; Joo, K; Joosten, Sj; Keller, D; Khachatryan, M; Khanal, A; Khandaker, M; Kim, Cw; Kim, W; Kubarovsky, V; Lanza, L; Leali, M; Lenisa, P; Livingston, K; Macgregor, Ijd; Marchand, D; Markov, N; Marsicano, L; Mascagna, V; Mayer, M; Mckinnon, B; Meziani, Ze; Mineeva, T; Mokeev, V; Munevar, E; Munoz Camacho, C; Nadel Turonski, P; O'Connell, Tr; Osipenko, M; Ostrovidov, Ai; Paolone, M; Pappalardo, Ll; Park, K; Pasyuk, E; Peng, P; Phelps, W; Pogorelko, O; Poudel, J; Price, Jw; Prok, Y; Puckett, Ajr; Raue, Ba; Ripani, M; Rizzo, A; Rosner, G; Salgado, C; Schmidt, A; Schumacher, Ra; Shrestha, U; Sokhan, D; Soto, O; Sparveris, N; Strakovsky, Ii; Strauch, S; Tan, Ja; Tyler, N; Ungaro, M; Venturelli, L; Voskanyan, H; Voutier, E; Walford, Nk; Whisnant, Cs; Wood, Mh; Zhang, J; Zhao, Zw

doi:10.1016/j.physletb.2020.135662

We report a measurement of a beam-target double-polarisation observable (E) for the (gamma) over right arrow(n) over right arrow (p) -> K+Sigma(-) (p) reaction. The data were obtained impinging the circularly-polarised energy-tagged photon beam of Hall B at Jefferson Lab on a longitudinally-polarised frozen-spin hydrogen deuteride (HD) nuclear target. The E observable for an effective neutron target was determined for centre-of-mass energies 1.70 <= W <= 2.30 GeV, with reaction products detected over a wide angular acceptance by the CLAS spectrometer. These new double-polarisation data give unique constraints on the strange decays of excited neutron states. Inclusion of the new data within the Bonn-Gatchina theoretical model results in significant changes for the extracted photocouplings of a number of established nucleon resonances. Possible improvements in the PWA description of the experimental data with additional "missing" resonance states, including the N(2120)(3/2-) resonance, are also quantified. Crown Copyright (C) 2020 Published by Elsevier B.V.

Zachariou, N., Watts, D.p., Fleming, J., Sarantsev, A.v., Nikonov, V.a., D'Angelo, A., et al. (2020). Beam–target helicity asymmetry E in K+Σ− photoproduction on the neutron. PHYSICS LETTERS. SECTION B, 808, 135662 [10.1016/j.physletb.2020.135662].