Single photoproduction of neutral π-mesons on deuterium in the forward direction at 4 GeV

We derive and apply the finite energy sum rules to pion photoproduction. We evaluate the low-energy part of the sum rules using several state-of-the-art models. We show how the differences in the low-energy side of the sum rules might originate from different quantum number assignments of baryon resonances. We interpret the observed features in the low-energy side of the sum rules with the expectation from Regge theory. Finally, we present a model, in terms of a Regge-pole expansion, that matches the sum rules and the high-energy observables.

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“…In this region we have the following data sets available: -Differential cross section for γp → π 0 p from Refs. [60][61][62][63].…”

Section: Combined Fit Of the Fesr And Observablesmentioning

confidence: 99%

“…Comparison between the observables computed with the parametrization of the amplitudes given by Eq (29). and Tables III, and IV and the data from[1,[60][61][62][63][64][65][66][67][68][69][70][71][72][73].…”

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confidence: 99%

Structure of pion photoproduction amplitudes

et al. 2018

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“…we do not flip the sign of g c 1 and g c 4 for a neutron target. We compare this prediction with the data [23,24] in the energy range 4 ≤ E γ (GeV) ≤ 8.2 in Fig. 2.…”

Section: Fitting Proceduresmentioning

confidence: 99%

“…1, the beam asymmetry [18], shown in Fig. 2, the ratio of differential cross section on neutron to proton targets [23,24], shown in Fig. 2, and on target and recoil asymmetries [25][26][27], shown in Fig.…”

Section: A Data Selection and Interpretationmentioning

confidence: 99%

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Neutral pion photoproduction in a Regge model

2015

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The reaction γp → π 0 p is investigated in the energy range above the resonance region. The amplitudes include the leading Regge singularities in the cross-channel and correctly describe the differential cross section for beam energies above 4 GeV and for the s−channel scattering angle cos θs ≥ 0.6. The energy dependence of the beam asymmetry and the reaction γn → π 0 n seem is quantitative consistent with the Regge-pole dominance.

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