Cross sections and beam asymmetries for \vev{e}p \to en\pi^+ in the nucleon resonance region for 1.7≤Q2≤4.5(GeV)21.7 \le Q^2 \le 4.5 (GeV)^2

The exclusive electroproduction process $\vec{e}p \to e^\prime n \pi^+$ was measured in the range of the photon virtuality $Q^2 = 1.7 - 4.5 \rm{GeV^2}$, and the invariant mass range for the $n\pi^+$ system of $W = 1.15 - 1.7 \rm{GeV}$ using the CEBAF Large Acceptance Spectrometer. For the first time, these kinematics are probed in exclusive $\pi^+$ production from protons with nearly full coverage in the azimuthal and polar angles of the $n\pi^+$ center-of-mass system. The $n\pi^+$ channel has particular sensitivity to the isospin 1/2 excited nucleon states, and together with the $p\pi^0$ final state will serve to determine the transition form factors of a large number of resonances. The largest discrepancy between these results and present modes was seen in the $\sigma_{LT'}$ structure function. In this experiment, 31,295 cross section and 4,184 asymmetry data points were measured. Because of the large volume of data, only a reduced set of structure functions and Legendre polynomial moments can be presented that are obtained in model-independent fits to the differential cross sections

Electroexcitation of the Roper resonance for 1.7 \u3c Q(2)\u3c 4.5 GeV2 in ep -\u3e en pi(+)

The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for 1.

Electroexcitation of the Roper resonance for 1.7

The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for 1.

Cross sections and beam asymmetries for (e)over-right-arrowp -\u3e en pi(+) in the nucleon resonance region for 1.7 \u3c= Q(2)\u3c= 4.5 GeV2

The exclusive electroproduction process (e) over right arrowp -\u3e e(\u27)n pi(+) was measured in the range of the photon virtuality Q(2)=1.7-4.5 GeV2, and the invariant mass range for the n pi(+) system of W=1.15-1.7 GeV using the CEBAF Large Acceptance Spectrometer. For the first time, these kinematics are probed in exclusive pi(+) production from protons with nearly full coverage in the azimuthal and polar angles of the n pi(+) center-of-mass system. The n pi(+) channel has particular sensitivity to the isospin 1/2 excited nucleon states, and together with the p pi(0) final state will serve to determine the transition form factors of a large number of resonances. The largest discrepancy between these results and present modes was seen in the sigma(\u27)(LT) structure function. In this experiment, 31,295 cross section and 4,184 asymmetry data points were measured. Because of the large volume of data, only a reduced set of structure functions and Legendre polynomial moments can be presented that are obtained in model-independent fits to the differential cross sections