E99-107
- Spokespersons
- P. Stoler, V.D.Burkert, R. Minehart, M. Taiuti
- Year
- 2006
- Abstract
- We report a new measurement of the exclusive electroproduction reaction g* 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. Itis 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 non-conservation, and the ratio S1+/M1+ is negative, while its magnitude increases with Q2.
- Publication
-
- M. Ungaro, P. Stoler, and CLAS Collabboration Measurement of the N → Δ+(1232) Transition at High Momentum Transfer by π0 Electroproduction // PRL 97, 112003 (2006)
- Quantities
- dσ/dΩ
Measurements
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ID | Quantity | Beam | Target | Final state |
Q2min, GeV2 |
Q2max, GeV2 |
Wmin, GeV |
Wmax, GeV |
---|---|---|---|---|---|---|---|---|
E37M1 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.11 | 1.11 |
E37M2 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.13 | 1.13 |
E37M3 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.15 | 1.15 |
E37M4 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.17 | 1.17 |
E37M5 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.19 | 1.19 |
E37M6 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.21 | 1.21 |
E37M7 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.23 | 1.23 |
E37M8 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.25 | 1.25 |
E37M9 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.27 | 1.27 |
E37M10 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.29 | 1.29 |
E37M11 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.31 | 1.31 |
E37M12 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.33 | 1.33 |
E37M13 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.35 | 1.35 |
E37M14 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.37 | 1.37 |
E37M15 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.39 | 1.39 |
E37M16 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.11 | 1.11 |
E37M17 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.13 | 1.13 |
E37M18 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.15 | 1.15 |
E37M19 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.17 | 1.17 |
E37M20 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.19 | 1.19 |
E37M21 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.21 | 1.21 |
E37M22 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.23 | 1.23 |
E37M23 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.25 | 1.25 |
E37M24 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.27 | 1.27 |
E37M25 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.29 | 1.29 |
E37M26 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.31 | 1.31 |
E37M27 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.33 | 1.33 |
E37M28 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.35 | 1.35 |
E37M29 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.37 | 1.37 |
E37M30 | dσ/dΩ | e | p | π0p | 3.5 | 3.5 | 1.39 | 1.39 |
E37M31 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.11 | 1.11 |
E37M32 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.13 | 1.13 |
E37M33 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.15 | 1.15 |
E37M34 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.17 | 1.17 |
E37M35 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.19 | 1.19 |
E37M36 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.21 | 1.21 |
E37M37 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.23 | 1.23 |
E37M38 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.25 | 1.25 |
E37M39 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.27 | 1.27 |
E37M40 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.29 | 1.29 |
E37M41 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.31 | 1.31 |
E37M42 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.33 | 1.33 |
E37M43 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.35 | 1.35 |
E37M44 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.37 | 1.37 |
E37M45 | dσ/dΩ | e | p | π0p | 3.0 | 3.0 | 1.39 | 1.39 |
E37M46 | dσ/dΩ | e | p | π0p | 4.2 | 4.2 | 1.39 | 1.39 |
E37M47 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.11 | 1.11 |
E37M48 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.13 | 1.13 |
E37M49 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.15 | 1.15 |
E37M50 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.17 | 1.17 |
E37M51 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.19 | 1.19 |
E37M52 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.21 | 1.21 |
E37M53 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.23 | 1.23 |
E37M54 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.25 | 1.25 |
E37M55 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.27 | 1.27 |
E37M56 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.29 | 1.29 |
E37M57 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.31 | 1.31 |
E37M58 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.33 | 1.33 |
E37M59 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.35 | 1.35 |
E37M60 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.37 | 1.37 |
E37M61 | dσ/dΩ | e | p | π0p | 5.0 | 5.0 | 1.39 | 1.39 |
E37M62 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.11 | 1.11 |
E37M63 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.13 | 1.13 |
E37M64 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.15 | 1.15 |
E37M65 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.17 | 1.17 |
E37M66 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.19 | 1.19 |
E37M67 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.21 | 1.21 |
E37M68 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.23 | 1.23 |
E37M69 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.25 | 1.25 |
E37M70 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.27 | 1.27 |
E37M71 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.29 | 1.29 |
E37M72 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.31 | 1.31 |
E37M73 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.33 | 1.33 |
E37M74 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.35 | 1.35 |
E37M75 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.37 | 1.37 |
E37M76 | dσ/dΩ | e | p | π0p | 6.0 | 6.0 | 1.39 | 1.39 |
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