Two-Photon Physics in Hadronic Processes

Carlson, Carl E.; Vanderhaeghen, Marc

doi:10.1146/annurev.nucl.57.090506.123116

Cited by 161 publications

(177 citation statements)

References 115 publications

(206 reference statements)

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“…An important application of CS concerns two-photon exchange (TPE) contributions to nucleon form factors. The issue resurfaced after measurements of the proton's form factor ratio µ p G E /G M and its deviation from unity; see [653,654] for reviews. The main problem is visualised in Fig.…”

Section: Overview Of Two-photon Physicsmentioning

confidence: 99%

“…[573] that TPE corrections can indeed generate large corrections to the ratio obtained with the Rosenbluth separation, whereas they would have a minimal impact on the ratio extracted from the polarisation transfer measurements. Explicit TPE calculations were subsequently performed using hadronic approaches including the elastic Born terms [656,657] and inelastic resonance contributions of the CS amplitude [658,659], as well as employing dispersion relations [660][661][662] and perturbative analyses at the quark level based on handbag and perturbative QCD mechanisms [653,[663][664][665][666].…”

Section: Overview Of Two-photon Physicsmentioning

confidence: 99%

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Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

436

530

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We review the spectrum and electromagnetic properties of baryons described as relativistic three-quark bound states within QCD. The composite nature of baryons results in a rich excitation spectrum, whilst leading to highly non-trivial structural properties explored by the coupling to external (electromagnetic and other) currents. Both present many unsolved problems despite decades of experimental and theoretical research. We discuss the progress in these fields from a theoretical perspective, focusing on nonperturbative QCD as encoded in the functional approach via Dyson-Schwinger and Bethe-Salpeter equations. We give a systematic overview as to how results are obtained in this framework and explain technical connections to lattice QCD. We also discuss the mutual relations to the quark model, which still serves as a reference to distinguish 'expected' from 'unexpected' physics. We confront recent results on the spectrum of non-strange and strange baryons, their form factors and the issues of two-photon processes and Compton scattering determined in the DysonSchwinger framework with those of lattice QCD and the available experimental data. The general aim is to identify the underlying physical mechanisms behind the plethora of observable phenomena in terms of the underlying quark and gluon degrees of freedom.

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Section: Overview Of Two-photon Physicsmentioning

confidence: 99%

Section: Overview Of Two-photon Physicsmentioning

confidence: 99%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

436

530

View full text Add to dashboard Cite

show abstract

“…The difference can be explained when the two photon exchange effect (TPE) [73][74][75][76] is taken into account (for review see [77]). Hence, a proper fit of the EM form-factors requires to take into account the TPE correction [37].…”

Section: Datamentioning

confidence: 99%

Neural network parameterizations of electromagnetic nucleon form-factors

Graczyk

Płoński

Sulej

2010

J. High Energ. Phys.

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Abstract:The electromagnetic nucleon form-factors data are studied with artificial feed forward neural networks. As a result the unbiased model-independent form-factor parametrizations are evaluated together with uncertainties. The Bayesian approach for the neural networks is adapted for χ 2 error-like function and applied to the data analysis. The sequence of the feed forward neural networks with one hidden layer of units is considered. The given neural network represents a particular form-factor parametrization. The so-called evidence (the measure of how much the data favor given statistical model) is computed with the Bayesian framework and it is used to determine the best form factor parametrization.

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“…[6] for a recent review on this subject). In particular, the two-photon exchange corrections to elastic electron-pion scattering have been calculated in ref.…”

Section: Introductionmentioning

confidence: 99%

Radiative corrections to electron–pion scattering revisited

Kaiser¹

2011

J. Phys. G: Nucl. Part. Phys.

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We calculate in closed analytical form the one-loop radiative corrections to electronpion scattering e − π − → e − π − . Concise expressions (in terms of dimensionless Mandelstam variables) are given for the pertinent interference terms between the tree diagram and the one-loop diagrams related to photonic vertex correction, vacuum polarization and two-photon exchange. Infrared finiteness of these virtual radiative corrections is achieved (in the standard way) by including soft photon radiation below an energy cutoff λ. We evaluate the finite part of the soft photon correction factor in the center-of-mass frame. For all contributions we keep the full dependence on the electron mass. The results for the loop amplitudes can be applied also to pion-pair production e − e + → π + π − . The radiative corrections to the corresponding total cross section are calculated with consideration of the pion-structure via a vector meson dominance form factor. We find that such an additional charge form factor (inserted into the photonic vertex correction of the pion) changes the radiative corrections to the total cross section by about −0.2%.

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Two-Photon Physics in Hadronic Processes

Cited by 161 publications

References 115 publications

Baryons as relativistic three-quark bound states

Baryons as relativistic three-quark bound states

Neural network parameterizations of electromagnetic nucleon form-factors

Radiative corrections to electron–pion scattering revisited

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