Differential cross section measurement of eta photoproduction on the proton from threshold to 1100 MeV
GRAAL collaboration: F. Renard, M. Anghinolfi, O. Bartalini, V., Bellini, J.-P. Bocquet, M. Capogni, M. Castoldi, P. Corvisiero, A. D'Angelo,, J.-P. Didelez, R. Di Salvo, C. Gaulard, G. Gervino, F. Ghio, B. Girolami, M., Guidal, E. Hourany, V. Kouznetsov, R. Kunne, A. Lapik
TL;DR
This study measures the differential cross section of eta photoproduction on protons from threshold to 1100 MeV, providing detailed data on the S11(1535) resonance and P-wave contributions to improve understanding of baryon resonance couplings.
Contribution
It offers the first comprehensive measurement covering the S11(1535) resonance region in eta photoproduction, enabling precise extraction of resonance parameters and insights into resonance contributions.
Findings
Full coverage of the S11(1535) resonance region.
Observation of P-wave contributions above 1000 MeV.
High precision data constraining baryon resonance couplings.
Abstract
The differential cross section for the reaction p(gamma, eta p) has been measured from threshold to 1100 MeV photon laboratory energy. For the first time, the region of the S11(1535) resonance is fully covered in a photoproduction experiment and allows a precise extraction of its parameters at the photon point. Above 1000 MeV, S-wave dominance vanishes while a P-wave contribution is observed whose nature will have to be clarified. These high precision data together with the already measured beam asymmetry data will provide stringent constraints on the extraction of new couplings of baryon resonances to the eta meson.
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