Document Type

Article

Publication Date

2016

DOI

10.1016/j.physletb.2016.01.044

Publication Title

Physics Letters B

Volume

755

Pages

64-69

Abstract

Results are presented for the first measurement of the double-polarization helicity asymmetry E for the ƞ photoproduction reaction ɣp -> ηp. Data were obtained using the FROzen Spin Target (FROST) with the CLAS spectrometer in Hall B at Jefferson Lab, covering a range of center-of-mass energy W from threshold to 2.15 GeV and a large range in center-of-mass polar angle. As an initial application of these data, the results have been incorporated into the Jülich-Bonn model to examine the case for the existence of a narrow N* resonance between 1.66 and 1.70 GeV. The addition of these data to the world database results in marked changes in the predictions for the Eobservable from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.

Comments

This is an open access article under the CC BY license.

(https://creativecommons.org/licenses/by/4.0/)

Original Publication Citation

Senderovich, I., Morrison, B. T., Dugger, M., Ritchie, B. G., Pasyuk, E., Tucker, R., . . . Zonta, I. (2016). First measurement of the helicity asymmetry E in η photoproduction on the proton. Physics Letters B, 755, 64-69. doi: 10.1016/j.physletb.2016.01.044

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