在N*共振区，对横向极化质子上ω光生过程中双极化可观测量F、P和H的首次测量。
First Measurements of the Double-Polarization Observables F, P, and H in ω Photoproduction off Transversely Polarized Protons in the N^{*} Resonance Region.
作者信息
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, Fradi A, Gilfoyle G P, Girod F X, Golovatch E, Gothe R W, Griffioen K A, Guidal M, Guo L, Hafidi K, Hanretty C, Harrison N, Hattawy M, Hayward T B, Heddle D, Hicks K, Holtrop M, Ilieva Y, Ireland D G, Ishkhanov B S, Isupov E L, Jenkins D, Jo H S, Johnston S, Joosten S, Kabir M L, Keith C D, Keller D, Khachatryan G, Khachatryan M, Khanal A, Khandaker M, Kim A, Kim W, Klein F J, Kubarovsky V, Kuleshov S V, Kunkel M C, Lanza L, Lenisa P, Livingston K, MacGregor I J D, Marchand D, McKinnon B, Meekins D G, Meyer C A, Mineeva T, Mokeev V, Montgomery R A, Movsisyan A, Munoz Camacho C, Nadel-Turonski P, Niccolai S, Niculescu G, Osipenko M, Ostrovidov A I, Paolone M, Pappalardo L L, Paremuzyan R, Pasyuk E, Payette D, Phelps W, Pierce J, Pogorelko O, Prok Y, Protopopescu D, Raue B A, Ripani M, Riser D, Ritchie B G, Rizzo A, Rosner G, Sabatié F, Salgado C, Schumacher R A, Seely M L, Sharabian Y G, Shrestha U, Skorodumina Iu, Sokhan D, Soto O, Sparveris N, Strakovsky I I, Strauch S, Taiuti M, Tan J A, Torayev B, Tyler N, Ungaro M, Voskanyan H, Voutier E, Walford N K, Wang R, Watts D P, Wei X, Wood M H, Zachariou N, Zhang J, Zhao Z W
机构信息
Florida State University, Tallahassee, Florida 32306, USA.
Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn, Germany.
出版信息
Phys Rev Lett. 2019 Apr 26;122(16):162301. doi: 10.1103/PhysRevLett.122.162301.
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.
利用横向靶极化以及来自杰斐逊实验室的CEBAF大接受度谱仪（CLAS）FROST实验的数据，首次给出了质子上ω光生过程中双极化可观测量的测量结果。在1200 - 2700 MeV能量范围内，使用圆偏振标记光子测量了束流 - 靶不对称性F；在1200 - 2000 MeV能量范围内，使用线偏振标记光子测量了束流 - 靶不对称性H和P。这些测量显著增加了极化可观测量的数据库。结果包含在两个分波分析中，并揭示了几个核子（N*）共振的显著贡献。特别地，观察到了《粒子物理评论》中列出的新N*共振的贡献，这有助于实现绘制核子共振谱的目标。
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