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Title: Determination of the beam-spin asymmetry of deuteron photodisintegration in the energy region Eγ=1.1 –2.3 GeV

The beam-spin asymmetry, Σ, for the reaction γd→ΣΣpn has been measured using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility (JLab) for six photon-energy bins, between 1.1 and 2.3 GeV, and proton angles in the center-of-mass frame, Θc.m., between 25° and 160°. These are the first measurements of beam-spin asymmetries at Θc.m.=90° for photon-beam energies above 1.6 GeV, and the first measurements for angles other than Θc.m.=90°. The angular and energy dependence of Σ is expected to aid in the development of QCD-based models to understand the mechanisms of deuteron photodisintegration in the transition region between hadronic and partonic degrees of freedom, where both effective field theories and perturbative QCD cannot make reliable predictions.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [5] ;  [6]
  1. Univ. of South Carolina, Columbia, SC (United States); George Washington Univ., Washington, DC (United States)
  2. Univ. of South Carolina, Columbia, SC (United States)
  3. Yerevan Physics Inst. (YerPhI) (Armenia)
  4. Florida Intl Univ., Miami, FL (United States)
  5. George Washington Univ., Washington, DC (United States)
  6. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); George Washington Univ., Washington, DC (United States), et. al.
Publication Date:
OSTI Identifier:
1179441
Report Number(s):
JLAB/PHY--15-2024; DOE/OR--23177-3326
Journal ID: ISSN 0556-2813; PRVCAN; TRN: US1600818
Grant/Contract Number:
AC05-060R23177
Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 5; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
CLAS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS