{ital E}{sub 1+}/{ital M}{sub 1+} and {ital S}{sub 1+}/{ital M}{sub 1+} from an analysis of {ital p}({ital e},{ital e}{prime}{ital p}){pi}{sup 0} in the region of the {Delta}(1232) resonance at {ital Q}{sup 2}=3.2(GeV/{ital c}){sup 2}
- Continuous Electron Beam Accelerator Facility, 12000 Jefferson Avenue, Newport News, Virginia 23606 (United States)
- Christopher Newport University, Newport News, Virginia 23606 (United States)
We have analyzed exclusive {ital p}({ital e},{ital e}{prime}{ital p}){pi}{sup 0} data to determine the electromagnetic and scalar transition multipoles in the mass region of the {Delta}(1232) at the highest {ital Q}{sup 2} value where data exist. The ratio of the electric quadrupole and the magnetic dipole transition moments is determined to be {ital E}{sub 1+}/{ital M}{sub 1+}=0.06{plus_minus}0.02{plus_minus}0.03, and for the scalar quadrupole transition we find {ital S}{sub 1+}/{ital M}{sub 1+}=0.07{plus_minus}0.02{plus_minus}0.03. The results rule out that perturbative QCD governs the dynamics of the {gamma}{sub {ital v}}{ital p}{Delta} transition at such {ital Q}{sup 2}. They are more consistent with predictions of relativistic extensions of the nonrelativistic constituent quark model. {copyright} {ital 1995} {ital The} {ital American} {ital Physical} {ital Society}.
- OSTI ID:
- 130773
- Journal Information:
- Physical Review Letters, Vol. 75, Issue 20; Other Information: PBD: 13 Nov 1995
- Country of Publication:
- United States
- Language:
- English
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