Relativistic Effects, QCD Mixing Angles and N->N<sub>gamma</sub> and Delta->N<sub>gamma</sub> Transition Form Factors

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It is shown that relativistic effects, considered in the framework of a relativistic quark model constructed in infinite momentum frame, improve the argument between theory and experiment for delta->N<sub>gamma</sub> transition. They enlarge the magnitudes of the amplitudes A<sup>P</sup><sub>(1/2)</sub> and A<sup>P</sup><sub>(3/2)</sub> and suppress with increasing Q<sup>2</sup> the magnetic form factor of delta->N<sub>gamma</sub> transition in comparison with proton magnetic form factor. The additional inclusion of not large QCD-inspired mixings of multiplet (56',0<sup>+</sup>) into the N and the delta improves further the agreement with experiment for this form factor and permits to describe its Q<sup>2</sup>-dependence at Q<sup>2</sup> < 3 GeV<sup>2</sup>. Predominantly due to ... continued below

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Aznauryan, Inna January 1, 1992.

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It is shown that relativistic effects, considered in the framework of a relativistic quark model constructed in infinite momentum frame, improve the argument between theory and experiment for delta->N<sub>gamma</sub> transition. They enlarge the magnitudes of the amplitudes A<sup>P</sup><sub>(1/2)</sub> and A<sup>P</sup><sub>(3/2)</sub> and suppress with increasing Q<sup>2</sup> the magnetic form factor of delta->N<sub>gamma</sub> transition in comparison with proton magnetic form factor. The additional inclusion of not large QCD-inspired mixings of multiplet (56',0<sup>+</sup>) into the N and the delta improves further the agreement with experiment for this form factor and permits to describe its Q<sup>2</sup>-dependence at Q<sup>2</sup> < 3 GeV<sup>2</sup>. Predominantly due to the relativistic effects non-zero values for electric and Coulombic form factors of delta->N<sub>gamma</sub> transition are obtained. It is predicted that the electric form factor is positive at Q<sup>2</

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  • Journal Name: Zeitschrift fuer Physik A

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  • Report No.: CEBAF-TH-92-17
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 954327
  • Archival Resource Key: ark:/67531/metadc928254

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  • January 1, 1992

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 1, 2016, 2:06 p.m.

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Aznauryan, Inna. Relativistic Effects, QCD Mixing Angles and N->N<sub>gamma</sub> and Delta->N<sub>gamma</sub> Transition Form Factors, article, January 1, 1992; [Newport News, Virginia]. (digital.library.unt.edu/ark:/67531/metadc928254/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.