Target asymmetry for neutral π meson photoproduction on polarized protons at 4 GeV in the forward direction

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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“…[25] being somehow below the data from Ref. [26] at small momentum transfers. However, the data presented on Fig.…”

Section: Fitting Proceduresmentioning

confidence: 56%

“…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. 4.…”

Section: A Data Selection and Interpretationmentioning

confidence: 99%

Neutral pion photoproduction in a Regge model

2015

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“…5. Data: SLAC [6] (black disks), GlueX-17 [7] (black open circles), Daresbury [32] (red triangles), DESY [33] (blue full squares), CEA [34] (blue open squares).…”

Section: Resultsmentioning

confidence: 99%

“…In the fits we have used the experimental data for the differential cross sections dσ/dt from DESY at E γ = 4 GeV [4] and E γ = 4, 5, and 5.8 GeV [5], and SLAC [6] at E γ = 6, 9, 12, and 15 GeV; the polarized-beam asymmetry Σ from SLAC [6] at E γ = 4, 6, and 10 GeV and GlueX [7] at E γ = 8.7 GeV; the target asymmetry T from Daresbury [32] and DESY [33], both at E γ = 4 GeV; the recoil polarization observable P from CEA [34] at E γ = 4.1 − 6.3 GeV; the differential cross section ratio of neutrons and protons, R np for π 0 photoproduction at E γ = 4 GeV [35,36] and E γ = 4.7 and 8.2 GeV [37].…”

Section: A Results On π 0 Photoproductionmentioning

confidence: 99%

Regge phenomenology in π0 and η photoproduction

2017

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The γN → π 0 N and γN → ηN reactions at photon beam energies above 4 GeV are investigated within Regge models. The models include t-channel exchanges of vector (ρ and ω) and axial vector (b1 and h1) mesons. Moreover, Regge cuts of ρP, ρf2, ωP, and ωf2 are investigated. A good description of differential cross sections and polarization observables at photon beam energies from 4 to 15 GeV can be achieved.

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“…For the same reason we also neglect F 4 in the present study. Our decision can be justified by considering the data [45,46,47] on the target (T ) and recoil (P ) asymmetry, available for the γp→π 0 p reaction at photon energies above 4 GeV. Since they fulfill roughly T ≃P one can conclude that F 4 ≃0, based on the relations given in Eqs.…”

Section: Each Regge Pole Helicity Amplitude Is Parameterized Asmentioning

confidence: 99%

Neutral pion photoproduction at high energies

et al. 2009

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A Regge model with absorptive corrections is employed in a global analysis of the world data on the reactions γp→π 0 p and γn→π 0 n for photon energies from 3 to 18 GeV. In this region resonance contributions are expected to be negligible so that the available experimental information on differential cross sections and single-and double polarization observables at −t≤2 GeV 2 allows us to determine the non-resonant part of the reaction amplitude reliably. The model amplitude is then used to predict observables for photon energies below 3 GeV. A detailed comparison with recent data from the CLAS and CB-ELSA Collaborations in that energy region is presented. Furthermore, the prospects for determining the π 0 radiative decay width via the Primakoff effect from the reaction γp→π 0 p are explored. PACS. 11.55.Jy Regge formalism -13.60.Le Meson production -13.60.-r Photon and charged-lepton interactions with hadrons -25.20.Lj Photoproduction reactions

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Target asymmetry for neutral π meson photoproduction on polarized protons at 4 GeV in the forward direction

Cited by 14 publications

References 7 publications

Neutral pion photoproduction in a Regge model

Neutral pion photoproduction in a Regge model

Regge phenomenology in π0 and η photoproduction

Neutral pion photoproduction at high energies

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