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Title: Photon beam asymmetry Σ in the reaction γ p p ω for E γ = 1.152 to 1.876 GeV

Photon beam asymmetry $$\Sigma$$ measurements for $$\omega$$ photoproduction in the reaction $$\vec{\gamma} p \to \omega p$$ are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using a linearly-polarized tagged photon beam, a cryogenic hydrogen target, and the CLAS spectrometer in Hall B at Jefferson Lab. The measurements we obtained markedly increase the size of the database for this observable, extend coverage to higher energies, and resolve discrepancies in previously published data. Comparisons of these new results with predictions from a chiral-quark-based model and from a dynamical coupled-channels model indicate the importance of interferences between $t$-channel meson exchange and $s$- and $u$-channel contributions, underscoring sensitivity to the nucleon resonances included in those descriptions. Comparisons with the Bonn-Gatchina partial-wave analysis indicate the $$\Sigma$$ data reported here help to fix the magnitudes of the interference terms between the leading amplitudes in that calculation (Pomeron exchange and the resonant portion of the $J^P=3/2^+$ partial wave), as well as the resonant portions of the smaller partial waves with $J^P$= $1/2^-$, $3/2^-$, and $5/2^+$.
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Publication Date:
Report Number(s):
JLAB-PHY-17-2545; DOE/OR/23177-4213; arXiv:1706.04280
Journal ID: ISSN 0370-2693; PII: S0370269317306366
Grant/Contract Number:
AC05-06OR23177; AC05-84ER40150; AC02-06CH11357; SC0016583
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 773; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); George Washington Univ., Washington, DC (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Research Foundation of Korea (NRF); United Kingdom Science and Technology Facilities Council
Contributing Orgs:
ATLAS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; beam asymmetry; meson photoproduction; omega photoproduction; polarization observable; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1389758
Alternate Identifier(s):
OSTI ID: 1393592; OSTI ID: 1439816