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Chiral Corrections to Baryon Electromagnetic Form Factors

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Abstract

Corrections motivated by chiral symmetry arguments have long been known to give important contributions to hadronic observables, particularly at low momentum transfer. It is possible to separate these approaches into two broad groups; either the corrections are implemented at the parton level, or at the hadron level. We explore the results of incorporating pion loop corrections at the hadron level to a calculation of electromagnetic form factors in the NJL model. These calculations are compared with the result of an earlier implementation of pion loops at the parton level using the same NJL model formalism. A particular parameter set yields a good description of low energy nucleon properties within both approaches. However, for the \(\varSigma ^-\) there is a remarkable improvement when the chiral corrections are implemented at the hadronic level.

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Acknowledgements

We would like to thank W. Bentz for helpful comments on the manuscript. This work was supported by the Australian Research Council through Grant DP150103101 (AWT) as well as through the ARC Centre of Excellence for Particle Physics at the Terascale, CE110001104.

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Authors and Affiliations

  1. CSSM and ARC Centre of Excellence for Particle Physics at the Tera-scale, Department of Physics, University of Adelaide, Adelaide, SA, 5005, Australia

    Robert J. Perry, Manuel E. Carrillo-Serrano & Anthony W. Thomas

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  1. Robert J. Perry
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  2. Manuel E. Carrillo-Serrano
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  3. Anthony W. Thomas
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Correspondence to Robert J. Perry.

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This article belongs to the Topical Collection “NSTAR 2017—The International Workshop on the Physics of Excited Nucleons”.

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Perry, R.J., Carrillo-Serrano, M.E. & Thomas, A.W. Chiral Corrections to Baryon Electromagnetic Form Factors. Few-Body Syst 59, 127 (2018). https://doi.org/10.1007/s00601-018-1449-9

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