0 0.1 0.2 0.3 0.4 -t+t$_{min}$ [GeV$^{2}$] 0 1 0 0.1 0.2 0.3 0.4 -t+t$_{min}$ [GeV$^{2}$] 0 0.1 0 1 2 T L TT LT 0 1 2 3 4 0 0.1 0.2 0.3 0.4 -t+t$_{min}$ [GeV$^{2}$] 0 0.1 0.2 0 0.1 0.2 0.3 0.4 -t+t$_{min}$ [GeV$^{2}$] 0 0.2 0.4 d /dt [ b/GeV 2 ] 0 10 20 30 d /dt [$^{µ}$ b/GeV 2 ] Q$^{2}$= 1.6 GeV 2 W = 3.0 GeV JLAB@12 GeV JLAB@12 GeV JLAB@12 GeV Q$^{2}$= 4.5 GeV 2 W = 3.28 GeV Q$^{2}$= 2.45 GeV 2 JLAB@12 GeV Q$^{2}$= 5.25 GeV 2 W = 3.20 GeV W = 3.20 GeV Q$^{2}$= 3.5 GeV 2 W = 3.1 GeV JLAB@12 GeV Q$^{2}$= 6 GeV 2 W = 3.20 GeV JLAB@12 GeV JLAB@12 GeV Q$^{2}$= 0.3 GeV 2 W = 2.2 GeV p( )n 26 FIG. 23: (Color online) − t + t$_{min}$ dependence of l/t separated differential cross sections dσ$_{T}$/dt (solid), dσ$_{L}$/dt (dashed), dσ$_{LT}$/dt (dash-dotted) and dσ$_{TT}$/dt (dash-dash-dotted) in exclusive reaction p ( γ $^{∗}$, π $^{+}$) n in the ( Q $^{2}$, W ) kinematics at JLAB@12. accurate determination of the longitudinal cross section needed for the extraction of the pion from factor feasible. In the π − channel the contribution of the tranverse and interference cross sections is predicted to be much smaller. As one can see in Figure 24 the π − electro- production cross section is largely longitudinal (dashed curves). If true this may provide a complimentary and probably more reliable access to the pion form factor from exclusive π − electroproduction off the deuteron target. In summary, a description of exclusive charged pion electroproduction ( e, e ′ π ± ) off nucleons at high energies is proposed. Following a two-component hadron-parton picture of Refs. [25, 27] the model combines a Regge pole approach with residual effects of nucleon resonances. The contribution of nucleon resonances has been assumed to be dual to direct partonic interaction and therefore de- scribes the hard part of the model cross sections. The resonance/partonic effects are taken into account us- ing a Bloom-Gilman connection between the exclusive hadronic form factors and inclusive deep inelastic struc- ture functions. In the soft hadronic sector the exchanges of π (140), vector ρ (770) and axial-vector a$_{1}$ (1260) and b$_{1}$ (1235) Regge trajectories have been considered. XIV. SUMMARY JLAB Q 2 W R = dσ$_{T}$/dσ$_{L}$ [GeV $^{2}$] [GeV] 5 GeV 1.60 2.2 0.43 2.45 2.2 0.68 12 GeV 1.60 3.0 0.28 2.45 3.0 0.32 TABLE II: The ratio R = dσ$_{T}$/dσ$_{L}$ of the transverse and longitudinal cross sections at forward angles t = t$_{min}$ in a kinematics of JLAB@5 with W = 2 . 2 GeV and JLAB@12 with W = 3 GeV and values of Q 2 = 1 . 6 and 2.45 GeV $^{2}$. We have shown that with only a few physical assump- tions a quantitative description of exclusive π + and π − electroproduction data can be achieved in a large range of ( Q $^{2}$, W ) from JLAB to DIS region at HERMES. In particular, the l/t partial longitudinal, transverse and interference cross sections measured at JLAB and DESY