Positive Photopion Production from Hydrogen Near Threshold

McPherson, Donald A.; Gates, Duane C.; Kenney, Robert W.; Swanson, W.P.

doi:10.1103/physrev.136.b1465

Cited by 20 publications

(10 citation statements)

References 24 publications

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“…Evaluating the rescattering term for the γp → γπN process in the soft-photon limit, as done in Eq. (25), ensures us that the full amplitude t γ,γπ satisfies the low energy theorem. Indeed, using Eq.…”

Section: Unitary Model For the γP → γπN Reactionmentioning

confidence: 93%

“…[24]. The data for γp → π + n are from McPherson [25], Fissum [26], MacCormick [23], and Ahrens [24].…”

Section: Unitary Model For the γP → πN Reactionmentioning

confidence: 99%

“…3, we show our results for the total γp → π 0 p cross section with the parameters G M = 3.00 and G E = 0.065, and compare with the data from Refs. [23][24][25][26]. The solid curve denotes the results obtained with our full unitary model while the dotted curve indicates the unitarized ∆ resonance contributions of Eq.…”

Section: Unitary Model For the γP → πN Reactionmentioning

confidence: 99%

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Unitary model for theγp→γπ0preaction and the magnetic dipole moment of theΔ+

et al. 2005

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Radiative pion photoproduction in the ∆(1232) resonance region is studied with the aim to access the ∆ + (1232) magnetic dipole moment. We present a unitary model of the γp → γπN (πN = π 0 p, π + n) reactions, where the πN rescattering is included in an on-shell approximation. In this model, the low energy theorem which couples the γp → γπN process in the limit of a soft final photon to the γp → πN process is exactly satisfied. We study the sensitivity of the γp → γπ 0 p process at higher values of the final photon energy to the ∆ + (1232) magnetic dipole moment. We compare our results with existing data and give predictions for forthcoming measurements of angular and energy distributions. It is found that the photon asymmetry and a helicity cross section are particularly sensitive to the ∆ + magnetic dipole moment.

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Section: Unitary Model For the γP → γπN Reactionmentioning

confidence: 93%

“…[24]. The data for γp → π + n are from McPherson [25], Fissum [26], MacCormick [23], and Ahrens [24].…”

Section: Unitary Model For the γP → πN Reactionmentioning

confidence: 99%

Section: Unitary Model For the γP → πN Reactionmentioning

confidence: 99%

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Unitary model for theγp→γπ0preaction and the magnetic dipole moment of theΔ+

et al. 2005

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“…[7] with experimental data from refs. [9][10][11]. Around the ∆-resonance mass, the model overestimates the experimental cross sections by about 10%.…”

Section: Jhep01(2014)077mentioning

confidence: 99%

Beam-helicity asymmetry in associated electroproduction of real photons ep → eγπN in the Δ-resonance region

Airapetian¹,

Акопов²,

Aschenauer³

et al. 2014

J. High Energ. Phys.

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Abstract:The beam-helicity asymmetry in associated electroproduction of real photons, ep → eγπN , in the ∆(1232)-resonance region is measured using the longitudinally polarized Hera positron beam and an unpolarized hydrogen target. Azimuthal Fourier amplitudes of this asymmetry are extracted separately for two channels, ep → eγπ 0 p and ep → eγπ + n, from a data set collected with a recoil detector. All asymmetry amplitudes are found to be consistent with zero.

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“…This has been experimentally verified in work on positive photopion production. [61][62][63][64][65][66][67][68][69][70][71][72][73] The form of Eq. (8) was limited to first order in pi 2 , w 2 , and k. Higher order terms could have been included, but we felt that the data were not sufficient to determine more parameters.…”

Section: A (Yn -» Ir~p) = 4:irw (W 2 )A 0~mentioning

confidence: 99%