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27 April 2024

» arxiv » 1901.8951

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Virtual Compton Scattering measurements in the nucleon resonance region
A. Blomberg ; H. Atac ; N. Sparveris ; M. Paolone ; P. Achenbach ; M. Benali ; J. Beričič ; R. Böhm ; L. Correa ; M.O. Distler ; A. Esser ; D. Flay ; H. Fonvieille ; I. Friščić ; Y. Kohl ; H. Merkel ; U. Müller ; Z. E. Meziani ; M. Mihovilovic ; J. Pochodzalla ; A. Polychronopoulou ; B. Pasquini ; M. Schoth ; F. Schulz ; S. Schlimme ; C. Sfienti ; S. Sirca ; A. Weber ;
Date:	25 Jan 2019
Abstract:	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 $alpha_E = (5.3 pm 0.6_{stat} pm 1.3_{sys})~10^{-4} fm^3$ 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 $N ightarrow Delta$ 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.
Source:	arXiv, 1901.8951
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