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Nucleon form factors, generalized parton distributions and quark angular momentum

  • Markus DiehlEmail author
  • Peter Kroll
Regular Article - Theoretical Physics

Abstract

We extract the individual contributions from u and d quarks to the Dirac and Pauli form factors of the proton, after a critical examination of the available measurements of electromagnetic nucleon form factors. From this data we determine generalized parton distributions for valence quarks, assuming a particular form for their functional dependence. The result allows us to study various aspects of nucleon structure in the valence region. In particular, we evaluate Ji’s sum rule and estimate the total angular momentum carried by valence quarks at the scale μ=2 GeV to be \(J_{v}^{u} = 0.230^{+ 0.009}_{- 0.024}\) and \(J_{v}^{d} = -0.004^{+ 0.010}_{- 0.016}\).

Keywords

Form Factor Parton Density Electromagnetic Form Factor Deeply Virtual Compton Scattering Proton Form Factor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We gratefully thank John Arrington for discussions of the proton form factors and for providing numerical values for several of his results, Mariaelena Boglione for providing numerical values of the extraction [116] of the Sivers function, Daniela Rohe for correspondence about the neutron form factor results [54, 55], and Thorsten Feldmann for his collaboration at an early stage of this project.

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Copyright information

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Authors and Affiliations

  1. 1.Deutsches Elektronen-Synchroton DESYHamburgGermany
  2. 2.Fachbereich PhysikUniversität WuppertalWuppertalGermany
  3. 3.Institut für Theoretische PhysikUniversität RegensburgRegensburgGermany

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