Measurement of the beam asymmetry and the target asymmetry in the photoproduction of mesons off the proton using CLAS at Jefferson Laboratory
The photoproduction of omega mesons off the proton has been studied in the reaction gamma p -> p omega using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the decay omega -> pi(+)pi(-)pi(0), using a transversely polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant nonzero values are observed for these asymmetries, reaching about 30-40% in the third-resonance region. New measurements for the photon-beam asymmetry Sigma are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional. photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from s-channel resonance production were found in addition to t-channel exchange processes.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); George Washington Univ., Washington, DC (United States); Mississippi State Univ., Mississippi State, MS (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Chilean Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); Instituto Nazionale di Fisica Nucleare (INFN); Centre National de la Recherche Scientifique (CNRS); Commissariat a l’Energie Atomique (CEA); Scottish Universities Physics Alliance (SUPA); United Kingdom Science and Technology Facilities Council; National Research Foundation of Korea (NRF); German Research Foundation (DFG); Russian Science Foundation
- Contributing Organization:
- The CLAS Collaboration
- Grant/Contract Number:
- AC05-06OR23177; FG02-92ER40735; SFB/TR110; 16-12-10267; SC0016583; FG02-07ER41528; AC02-06CH11357
- OSTI ID:
- 1436860
- Alternate ID(s):
- OSTI ID: 1436016; OSTI ID: 1439829; OSTI ID: 1490802
- Report Number(s):
- JLAB-PHY-17-2583; DOE/OR/23177-4243; arXiv:1711.05176; PRVCAN; TRN: US1900237
- Journal Information:
- Physical Review C, Vol. 97, Issue 5; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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journal | December 2019 |
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