The ep -> e\'pi^+n reaction was studied in the first and second nucleon resonance regions
in the 0.25 GeV^2 < Q^2 < 0.65 GeV^2 range using the CLAS detector at Thomas Jefferson
National Accelerator Facility. For the first time the absolute cross sections were measured covering
nearly the full angular range in the hadronic center-of-mass frame. The structure functions sigma_TL,
sigma_TT and the linear combination sigma_T+epsilon*sigma_L were extracted by fitting the
phi-dependence of the measured cross sections, and were compared to the MAID and Sato-Lee models. |
