$\Delta$ resonance contribution to two-photon exchange in electron-proton scattering

S. Kondratyuk; P. G. Blunden; W. Melnitchouk; J. A. Tjon

doi:10.1103/PhysRevLett.95.172503

$\Delta$ resonance contribution to two-photon exchange in electron-proton scattering

Nuclear Theory 2014-11-18 v2

Authors: S. Kondratyuk , P. G. Blunden , W. Melnitchouk , J. A. Tjon

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Abstract

We calculate the effects on the elastic electron-proton scattering cross section of the two-photon exchange contribution with an intermediate $\Delta$ resonance. The $\Delta$ two-photon exchange contribution is found to be smaller in magnitude than the previously evaluated nucleon contribution, with an opposite sign at backward scattering angles. The sum of the nucleon and $\Delta$ two-photon exchange corrections has an angular dependence compatible with both the polarisation transfer and the Rosenbluth methods of measuring the nucleon electromagnetic form factors.

Keywords

two-photon exchange delta resonance electron-proton scattering electromagnetic form factors polarization transfer rosenbluth method

Cite

@article{arxiv.nucl-th/0506026,
  title  = {$\Delta$ resonance contribution to two-photon exchange in electron-proton scattering},
  author = {S. Kondratyuk and P. G. Blunden and W. Melnitchouk and J. A. Tjon},
  journal= {arXiv preprint arXiv:nucl-th/0506026},
  year   = {2014}
}

Comments

9 pages, 3 figures, RevTeX4; more complete discussion of results, conclusions unchanged; to be published in Physical Review Letters

$\Delta$ resonance contribution to two-photon exchange in electron-proton scattering

Abstract

Keywords

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