Virtual Compton scattering measurements in the nucleon resonance region

Blomberg, A.; Atac, H.; Sparveris, Nikolaos; 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.; Polychronopoulou, A.; Pasquini, B.; Schoth, M.; Schulz, F.; Schlimme, S.; Sfienti, C.; Sirca, S.; Weber, A.

doi:10.1140/epja/i2019-12877-0

Title: Virtual Compton scattering measurements in the nucleon resonance region

Journal Article · 22 October 2019 · European Physical Journal. A

DOI: https://doi.org/10.1140/epja/i2019-12877-0 · OSTI ID:1596686

Blomberg, A. ^[1]; Atac, H. ^[2]; Sparveris, Nikolaos ^[2]; Paolone, M. ^[2]; Achenbach, P. ^[3]; Benali, M. ^[4]; Beričič, J. ^[5]; Böhm, R. ^[3]; Correa, L. ^[3]; Distler, M. O. ^[3]; Esser, A. ^[3]; Flay, D. ^[2]; Fonvieille, H. ^[4]; Friščić, I. ^[3]; Kohl, Y. ^[3]; Merkel, H. ^[3]; Müller, U. ^[3]; Meziani, Z. E. ^[2]; Mihovilovic, M. ^[5]; Pochodzalla, J. ^[3] more »

Temple Univ., Philadelphia, PA (United States); Temple University
Temple Univ., Philadelphia, PA (United States)
Johannes Gutenberg Univ., Mainz (Germany)
Clermont Univ., Clermont-Ferrand (France)
Jozef Stefan Inst. (IJS), Ljubljana (Slovenia)
Univ. of Pavia (Italy)
Jozef Stefan Inst. (IJS), Ljubljana (Slovenia); Univ. of Ljubljana (Slovenia)

We report on new measurements of the electric Generalized Polarizability (GP) of the proton $ \alpha_{E}$ in a kinematic region where a puzzling dependence on momentum transfer has been observed, and we have found that $ \alpha_E = (5.3 \pm 0.6_{stat} \pm 1.3_{sys}) 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 $ \alpha_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 \rightarrow \Delta$ transition through the exploration of the $ p(e,e'p)\gamma$ reaction. The new measurement gives $ CMR = (-4.4 \pm 0.8_{stat} \pm 0.6_{sys})\%$ 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.

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Research Organization:: Temple Univ., Philadelphia, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); German Research Foundation

Grant/Contract Number:: SC0016577

OSTI ID:: 1596686

Journal Information:: European Physical Journal. A, Journal Name: European Physical Journal. A Journal Issue: 10 Vol. 55; ISSN 1434-6001

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

New Insight in the Q 2 Dependence of Proton Generalized Polarizabilities Beričič, J.; Correa, L.; Benali, M. Physical Review Letters, Vol. 123, Issue 19 https://doi.org/10.1103/physrevlett.123.192302	journal	November 2019
New Insight in the Q2 Dependence of Proton Generalized Polarizabilities Unknown, (:Unkn) My University https://doi.org/10.34944/dspace/4508	text	January 2019

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