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First measurement of the helicity asymmetry E in η photoproduction on the proton
Senderovich, I Morrison, BT Dugger, M Ritchie, BG Pasyuk, E Tucker, R Brock, J Carlin, C Keith, CD Meekins, DG
Senderovich, I
Morrison, BT
Dugger, M
Ritchie, BG
Pasyuk, E
Tucker, R
Brock, J
Carlin, C
Keith, CD
Meekins, DG
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Journal Article
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2016-04-10
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10.1016/j.physletb.2016.01.044
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© 2016 Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction γp→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 E observable from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
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