Beam-Target Helicity Asymmetry for γ[over →]n[over →]→π^{-}p in the N^{*} Resonance Region.
作者信息
Ho D, Peng P, Bass C, Collins P, D'Angelo A, Deur A, Fleming J, Hanretty C, Kageya T, Khandaker M, Klein F J, Klempt E, Laine V, Lowry M M, Lu H, Nepali C, Nikonov V A, O'Connell T, Sandorfi A M, Sarantsev A V, Schumacher R A, Strakovsky I I, Švarc A, Walford N K, Wei X, Whisnant C S, Workman R L, Zonta I, Adhikari K P, Adikaram D, Akbar Z, Amaryan M J, Anefalos Pereira S, Avakian H, Ball J, Bashkanov M, Battaglieri M, Batourine V, Bedlinskiy I, Biselli A, Briscoe W J, Burkert V D, Carman D S, Celentano A, Charles G, Chetry T, Ciullo G, Clark L, Colaneri L, Cole P L, Contalbrigo M, Crede V, Dashyan N, De Sanctis E, De Vita R, Djalali C, Dupre R, El Alaoui A, El Fassi L, Elouadrhiri L, Eugenio P, Fedotov G, Fegan S, Fersch R, Filippi A, Fradi A, Ghandilyan Y, Gilfoyle G P, Girod F X, Glazier D I, Gleason C, Gohn W, Golovatch E, Gothe R W, Griffioen K A, Guidal M, Guo L, Hakobyan H, Harrison N, Hattawy M, Hicks K, Holtrop M, Hughes S M, Ilieva Y, Ireland D G, Ishkhanov B S, Isupov E L, Jenkins D, Jiang H, Jo H S, Joo K, Joosten S, Keller D, Khachatryan G, Kim A, Kim W, Klein A, Kubarovsky V, Kuleshov S V, Lanza L, Lenisa P, Livingston K, MacGregor I J D, Markov N, McKinnon B, Mineeva T, Mokeev V, Montgomery R A, Movsisyan A, Munoz Camacho C, Murdoch G, Niccolai S, Niculescu G, Osipenko M, Paolone M, Paremuzyan R, Park K, Pasyuk E, Phelps W, Pogorelko O, Price J W, Procureur S, Protopopescu D, Ripani M, Riser D, Ritchie B G, Rizzo A, Rosner G, Sabatié F, Salgado C, Sharabian Y G, Skorodumina Iu, Smith G D, Sober D I, Sokhan D, Sparveris N, Strauch S, Tian Ye, Torayev B, Ungaro M, Voskanyan H, Voutier E, Watts D P, Wood M H, Zachariou N, Zhang J, Zhao Z W
机构信息
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
University of Virginia, Charlottesville, Virginia 22903, USA.
出版信息
Phys Rev Lett. 2017 Jun 16;118(24):242002. doi: 10.1103/PhysRevLett.118.242002.
We report the first beam-target double-polarization asymmetries in the γ+n(p)→π^{-}+p(p) reaction spanning the nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several γnN^{*} resonance photocouplings.
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