Total photoabsorption cross sections for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mpr

MacCormick, M.; Audit, G.; d’Hose, N.; Ghedira, L.; Isbert, V.; Kerhoas, S.; Murphy, L. Y.; Tamas, G.; Wallace, Peter G.; Altieri, S.; Braghieri, A.; Pedroni, P.; Pinelli, T.; Ahrens, J.; Beck, R.; Annand, J. R. M.; Crawford, R. A. D.; Kellie, J. D.; MacGregor, I. J. D.; Dolbilkin, B.S.; Zabrodin, A.

doi:10.1103/physrevc.53.41

Cited by 112 publications

(95 citation statements)

References 19 publications

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“…At high ν, above the resonance region, one usually invokes [34] for the total cross section (solid line), one-pion channels (dashed line), more-pion channels (dash-dotted line), and η channel (dotted line). The data for the total cross section are from MAMI [35] (full circles) and Daresbury [36] (open circles). The triangles represent the data for the 2π channels [37] .…”

Section: Photoabsorption Cross Sections For the Protonmentioning

confidence: 99%

The Gerasimov-Drell-Hearn Sum Rule and the Spin Structure of the Nucleon

Drechsel

Tiator

2004

Annu. Rev. Nucl. Part. Sci.

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The Gerasimov-Drell-Hearn sum rule is one of several dispersive sum rules that connect the Compton scattering amplitudes to the inclusive photoproduction cross sections of the target under investigation. Being based on such universal principles as causality, unitarity, and gauge invariance, these sum rules provide a unique testing ground to study the internal degrees of freedom that hold the system together. The present article reviews these sum rules for the spin-dependent cross sections of the nucleon by presenting an overview of recent experiments and theoretical approaches. The generalization from real to virtual photons provides a microscope of variable resolution: At small virtuality of the photon, the data sample information about the long range phenomena, which are described by effective degrees of freedom (Goldstone bosons and collective resonances), whereas the primary degrees of freedom (quarks and gluons) become visible at the larger virtualities. Through a rich body of new data and several theoretical developments, a unified picture of virtual Compton scattering emerges, which ranges from coherent to incoherent processes, and from the generalized spin polarizabilities on the low-energy side to higher twist effects in deep inelastic lepton scattering.

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Section: Photoabsorption Cross Sections For the Protonmentioning

confidence: 99%

The Gerasimov-Drell-Hearn Sum Rule and the Spin Structure of the Nucleon

Drechsel

Tiator

2004

Annu. Rev. Nucl. Part. Sci.

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“…Three different approaches are compared: equivalent photons approximation (EPA), transverse photon flux (TPF), and deep-inelastic scattering (DIS) structure The σγp cross-section. Filled circles correspond to the PDG collection [5], empty circles correspond to the Mainz data [6], and squares correspond to the HERA data [7]. The dotted line is the Froissart bound ln 2 (s) approximation, the dashed line is the non-saturated unitarity ln(s) approximation, the thin solid line is the ln(E) approximation, and the thick solid line is the resulting GEANT4 approximation (at high energies it coincides with the thin solid and the dashed lines).…”

Section: Introductionmentioning

confidence: 99%

Approximation of photonuclear interaction cross-sections

Kossov¹

2002

Eur Phys J A

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Abstract. Photonuclear interaction cross-sections from the GEANT4 database are approximated for all nuclei and all energies (from the hadron production threshold to about 40 TeV). The approximation methods in the giant-dipole resonance region, nucleon resonance region, and high-energy region are improved with respect to existing approximations. As an application of the approximation for photonuclear cross-sections, an improved method of calculating electronuclear cross-sections is developed. The interaction cross-section of virtual photons with nuclei at high Q 2 are approximated and a simple algorithm for describing the electronuclear reactions, including high-Q 2 scattering, is proposed.

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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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Total photoabsorption cross sections forH1,H

Cited by 112 publications

References 19 publications

The Gerasimov-Drell-Hearn Sum Rule and the Spin Structure of the Nucleon

The Gerasimov-Drell-Hearn Sum Rule and the Spin Structure of the Nucleon

Approximation of photonuclear interaction cross-sections

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

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