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gamma N --> Delta at JLab: Exploring the High Q2 Regime

Maurizio Ungaro ; Kyungseon Jo ; Paul Stoler

AIP Conference Proceedings, 2007, Vol.904 [Periódico revisado por pares]

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Título:
gamma N --> Delta at JLab: Exploring the High Q2 Regime
Autor: Maurizio Ungaro ; Kyungseon Jo ; Paul Stoler
Assuntos: DIFFERENTIAL CROSS SECTIONS ; ELECTROPRODUCTION ; FORM FACTORS ; HADRONS ; HELICITY ; MULTIPOLES ; PHYSICS ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; PROTONS ; SCALARS ; SHAPE
É parte de: AIP Conference Proceedings, 2007, Vol.904
Notas: USDOE - Office of Energy Research (ER)
AC05-84ER40150
JLAB-PHY-07-684; DOE/ER/40150-4296
Descrição: We report a new measurement of the exclusive electroproduction reaction gamma* p --> pi0 p to explore the evolution from soft non-perturbative 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 GM* decreases with Q2 more steeply than the proton magnetic form factor, the ratio E1+/M1+ is small and negative, indicating strong helicity non-conservation, and the ratio S1+/M1+ is negative, while its magnitude increases with Q2.
Editor: United States
Idioma: Inglês

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