Investigation of the conjectured nucleon deformation at low momentum transfer

Details Investigation of the conjectured nucleon deformation at low momentum transfer Investigation of the conjectured nucleon deformation at low momentum transfer

2004-08-04

arxiv.org/abs/nucl-ex/0408003v1

Phys.Rev.Lett. 94 (2005) 022003

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 1figure

Scientific paper

10.1103/PhysRevLett.94.022003

We report new precise H$(e,e^\prime p)\pi^0$ measurements at the $\Delta(1232)$ resonance at $Q^2= 0.127$ (GeV/c)$^2$ using the MIT/Bates out-of-plane scattering (OOPS) facility. The data reported here are particularly sensitive to the transverse electric amplitude ($E2$) of the $\gamma^* N\to\Delta$ transition. Analyzed together with previous data yield precise quadrupole to dipole amplitude ratios $EMR = (-2.3 \pm 0.3_{stat+sys} \pm 0.6_{model})%$ and $CMR = (-6.1 \pm 0.2_{stat+sys}\pm 0.5_{model})%$ and for $M^{3/2}_{1+} = (41.4 \pm 0.3_{stat+sys}\pm 0.4_{model})(10^{-3}/m_{\pi^+})$. They give credence to the conjecture of deformation in hadronic systems favoring, at low $Q^2$, the dominance of mesonic effects.

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