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High-statistics differential cross sections for the reactions γp→pη and γp→pη′ have been measured using the CEBAF large acceptance spectrometer (CLAS) at Jefferson Lab for center-of-mass energies from near threshold up to 2.84 GeV. The η′ results are the most precise to date and provide the largest energy and angular coverage. The η measurements extend the energy range of the world’s large-angle results by approximately 300 MeV. These new data, in particular the η′ measurements, are likely to help constrain the analyses being performed to search for new baryon resonance states.


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Physical Review C

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M. Williams et al. [CLAS Collaboration], "Differential cross sections for the reactions γp→pη and γp→pη′," Physical Review C 80.4 (2009) DOI: 10.1103/PhysRevC.80.045213



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