Document Type
Article
Department/Program
Physics
Journal Title
PHYSICS LETTERS B
Pub Date
10-10-2017
Volume
773
Abstract
Photon beam asymmetry Sigma measurements for omega photoproduction in the reaction gamma (gamma) over right arrow p -> 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 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(+). (C) 2017 The Author(s). Published by Elsevier B.V.
Recommended Citation
Collins, P. and Griffioen, Keith, Photon beam asymmetry Sigma in the reaction <(gamma)over right arrow> -> p omega for E-gamma=1.152 to 1.876 GeV (2017). PHYSICS LETTERS B, 773.
https://doi.org/10.1016/j.physletb.2017.08.015
DOI
https://doi.org/10.1016/j.physletb.2017.08.015
