Study of the Delta (1232) Using Double Polarization Asymmetries

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An extensive experimental program to measure the spin structure of the nucleus is underway in Hall B at Jefferson Lab using a polarized electron beam incident on a polarized target. Spin degrees of freedom offer the possibility to test, in an independent way, existing models of resonance electro-production. The present analysis selects the Delta{sup +} (1232) in the exclusive channel {rvec p}({rvec e}, e'p)pi{sup 0} from data of the EG1 run period, taken in the Fall of 1998, to extract single and double asymmetries in a Q{sup 2} range from 0.5 to 1.5 GeV{sup 2}/c{sup 2}. Results of the asymmetries ... continued below

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62,200 Kilobytes pages

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Biselli, Angela March 1, 2002.

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An extensive experimental program to measure the spin structure of the nucleus is underway in Hall B at Jefferson Lab using a polarized electron beam incident on a polarized target. Spin degrees of freedom offer the possibility to test, in an independent way, existing models of resonance electro-production. The present analysis selects the Delta{sup +} (1232) in the exclusive channel {rvec p}({rvec e}, e'p)pi{sup 0} from data of the EG1 run period, taken in the Fall of 1998, to extract single and double asymmetries in a Q{sup 2} range from 0.5 to 1.5 GeV{sup 2}/c{sup 2}. Results of the asymmetries are presented as a function of momentum transfer Q{sup 2}. A comparison with the Effective Lagrangian Model by R. Davidson and N. Mukhopadhyay, the unitary isobar model MAID, and the dynamic model by Sato and Lee was performed. The data were found to be generally in good agreement with the models and a x{sup 2} comparison preferred the Sato-Lee model, which is tailored for the Delta (1232) photo- and electro-production. The present results are the first measurement of asymmetries for the exclusive reaction {rvec p}({rvec e}, e'p)pi{sup 0} and will provide new constraints for the models.

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62,200 Kilobytes pages

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  • Other Information: TH: Thesis; Thesis information not provided

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  • Report No.: JLAB-PHY-02-109
  • Report No.: DOE/ER/40150-2766
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 824942
  • Archival Resource Key: ark:/67531/metadc779232

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 1, 2002

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  • Dec. 3, 2015, 9:30 a.m.

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  • Aug. 5, 2016, 3:37 p.m.

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Biselli, Angela. Study of the Delta (1232) Using Double Polarization Asymmetries, thesis or dissertation, March 1, 2002; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc779232/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.