Measurement of the N --> Delta^+ (1232) Transition at High-Momentum Transfer by pi^0 Electroproduction

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We report a new measurement of the exclusive electroproduction reaction gamma*_p --> pi0_p to explore the evolution from soft nonperturbative physics to hard processes via the Q2 dependence of the magnetic (M1+), electric (E1+), and scalar (S1+) multipoles in the N --> Delta transition. 9000 differential cross section data points cover W from threshold to 1.4 GeV/c2, 4pi center-of-mass solid angle, and Q2 from 3 to 6 GeV2/c2, the highest yet achieved. It is found that the magnetic form factor G^*M decreases with Q2 more steeply than the proton magnetic form factor, the ratio E1+/M1+ is small and negative, indicating ... continued below

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112003

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Ungaro, M.; Stoler, P.; Aznauryan, I.; Burkert, V. D.; Joo, K.; Smith, L. C. et al. September 1, 2006.

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We report a new measurement of the exclusive electroproduction reaction gamma*_p --> pi0_p to explore the evolution from soft nonperturbative physics to hard processes via the Q2 dependence of the magnetic (M1+), electric (E1+), and scalar (S1+) multipoles in the N --> Delta transition. 9000 differential cross section data points cover W from threshold to 1.4 GeV/c2, 4pi center-of-mass solid angle, and Q2 from 3 to 6 GeV2/c2, the highest yet achieved. It is found that the magnetic form factor G^*M decreases with Q2 more steeply than the proton magnetic form factor, the ratio E1+/M1+ is small and negative, indicating strong helicity nonconservation, and the ratio S1+/M1+ is negative, while its magnitude increases with Q2.

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112003

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  • Journal Name: Physical Review Letters; Journal Volume: 97

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  • Report No.: JLAB-PHY-06-543
  • Report No.: hep-ex/0606042
  • Report No.: DOE/ER/40150-4262
  • Grant Number: AC05-84ER40150
  • DOI: 10.1103/PhysRevLett.97.112003 | External Link
  • Office of Scientific & Technical Information Report Number: 902745
  • Archival Resource Key: ark:/67531/metadc882627

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

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  • September 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 22, 2016, 1:18 p.m.

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Ungaro, M.; Stoler, P.; Aznauryan, I.; Burkert, V. D.; Joo, K.; Smith, L. C. et al. Measurement of the N --> Delta^+ (1232) Transition at High-Momentum Transfer by pi^0 Electroproduction, article, September 1, 2006; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc882627/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.