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First Measurements of the Double-Polarization Observables F, P, and H in ω Photoproduction off Transversely Polarized Protons in the N

Roy, P; Park, S; Crede, V; Anisovich, A V; Klempt, E; Nikonov, V A; Sarantsev, A V; Wei, N C; Huang, F; Nakayama, K; Adhikari, K P; Adhikari, S; Angelini, G; Avakian, H; Barion, L; Battaglieri, M; Bedlinskiy, I; Biselli, A S; Boiarinov, S; Briscoe, W J; Brock, J; Brooks, W K; Burkert, V D; Cao, F; Carlin, C; Carman, D S; Celentano, A; Chatagnon, P; Chetry, T; Ciullo, G; Cole, P L; Contalbrigo, M; Cortes, O; D'Angelo, A; Dashyan, N; De Vita, R; De Sanctis, E; Deur, A; Diehl, S; Djalali, C; Dugger, M; Dupre, R; Duran, B; Egiyan, H; Ehrhart, M; El Alaoui, A; El Fassi, L; Eugenio, P; Fegan, S; Filippi, A.

Phys Rev Lett ; 122(16): 162301, 2019 Apr 26.

Article En | MEDLINE | ID: mdl-31075002

First measurements of double-polarization observables in ω photoproduction off the proton are presented using transverse target polarization and data from the CEBAF Large Acceptance Spectrometer (CLAS) FROST experiment at Jefferson Lab. The beam-target asymmetry F has been measured using circularly polarized, tagged photons in the energy range 1200-2700 MeV, and the beam-target asymmetries H and P have been measured using linearly polarized, tagged photons in the energy range 1200-2000 MeV. These measurements significantly increase the database on polarization observables. The results are included in two partial-wave analyses and reveal significant contributions from several nucleon (N^{*}) resonances. In particular, contributions from new N^{*} resonances listed in the Review of Particle Properties are observed, which aid in reaching the goal of mapping out the nucleon resonance spectrum.