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We report new precision p(e,e pi+})n measurements in the Delta(1232) resonance at Q2 = 0.127(GeV/c)2 obtained at the MIT-Bates Out-Of-Plane scattering facility. These are the lowest, but non-zero, Q2 measurements in the pi+ channel. The data offer ne w tests of the theoretical calculations, particularly of the background amplitude contributions. The chiral effective field theory and Sato-Lee model calculations are not in agreement with this experiment.
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 stu died 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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