Journal Article FZJ-2016-01336

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First measurement of the helicity asymmetry E in η photoproduction on the proton

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2016
North-Holland Publ. Amsterdam

Physics letters / B 755, 64–69 () [10.1016/j.physletb.2016.01.044]

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Abstract: Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction γp→ηpγp→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⁎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.

Classification:

Contributing Institute(s):
  1. Experimentelle Hadronstruktur (IKP-1)
  2. JARA-FAME (JARA-FAME)
  3. JARA - HPC (JARA-HPC)
Research Program(s):
  1. 612 - Cosmic Matter in the Laboratory (POF3-612) (POF3-612)
  2. Unified analysis of photon- and pion-induced reactions in the hadron exchange picture (jikp07_20110501) (jikp07_20110501)

Appears in the scientific report 2016
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JARA > JARA > JARA-JARA\-FAME
JARA > JARA > JARA-JARA\-HPC
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 Record created 2016-01-29, last modified 2021-01-29