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- Title
Virtual Compton scattering measurements in the nucleon resonance region.
- Authors
Blomberg, A.; Atac, H.; Sparveris, N.; Paolone, M.; Achenbach, P.; Benali, M.; Beričič, J.; Böhm, R.; Correa, L.; Distler, M. O.; Esser, A.; Flay, D.; Fonvieille, H.; Friščić, I.; Kohl, Y.; Merkel, H.; Müller, U.; Meziani, Z. E.; Mihovilovic, M.; Pochodzalla, J.
- Abstract
We report on new measurements of the electric Generalized Polarizability (GP) of the proton α E in a kinematic region where a puzzling dependence on momentum transfer has been observed, and we have found that α E = (5. 3 ± 0. 6 s t a t ± 1. 3 s y s) 10 - 4 fm3 at Q 2 = 0. 20 (GeV/c)2. The new measurements, when considered along with the rest of the world data, suggest that α E can be described by either a local plateau or by an enhancement in the region Q 2 = 0. 20 (GeV/c)2 to 0.33 (GeV/c)2. The experiment also provides the first measurement of the Coulomb quadrupole amplitude in the N → Δ transition through the exploration of the p (e , e p) γ reaction. The new measurement gives C M R = (- 4. 4 ± 0. 8 s t a t ± 0. 6 s y s) % at Q 2 = 0. 20 (GeV/c)2 and is consistent with the results from the pion electroproduction world data. It has been obtained using a completely different extraction method, and therefore represents a strong validation test of the world data model uncertainties.
- Subjects
COMPTON scattering; ELECTRIC measurements; MOMENTUM transfer; RESONANCE; NUCLEON-nucleon scattering; PROTONS; DATA modeling
- Publication
European Physical Journal A -- Hadrons & Nuclei, 2019, Vol 55, Issue 10, pN.PAG
- ISSN
1434-6001
- Publication type
Letter
- DOI
10.1140/epja/i2019-12877-0