Virtual Compton Scattering measurements in the $γ^* N\to Δ$ transition

Details Virtual Compton Scattering measurements in the $γ^* N\to Δ$ transition Virtual Compton Scattering measurements in the $γ^* N\to Δ$ transition

2008-04-08

arxiv.org/abs/0804.1169v1

Phys.Rev.C78:018201,2008

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 4 figures

Scientific paper

10.1103/PhysRevC.78.018201

We report on new H$(e,e^\prime p)\gamma$ measurements in the $\Delta(1232)$ resonance at $Q^2=0.06$ (GeV/c) carried out simultaneously with H$(e,e^\prime p)\pi^0$. It is the lowest $Q^2$ for which the virtual Compton scattering (VCS) reaction has been studied in the first resonance region. The VCS measured cross sections are well described by dispersion-relation calculations in which the multipole amplitudes derived from H$(e,e^\prime p)\pi^0$ data are used as input, thus confirming the compatibility of the results. The derived resonant magnetic dipole amplitude $M^{3/2}_{1+} = (40.60 \pm 0.70_{stat+sys})(10^{-3}/m_{\pi^+})$ at $W=$ 1232 MeV is in excellent agreement with the value extracted from H$(e,e^\prime p)\pi^0$ measurements.

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