We report measurements of the electroproduction of single charged pions from hydrogen and deuterium targets for values of r in the range 0.35 < r < 0.45. Data were taken with a hydrogen target at the (W,Q ' ) points (2.15 GeV, 1.2 G~v~) ,(2.65, 2.0), (2.65, 3.4), (2.65, 6.0), and (2.65, 10.0). Data were taken with a deuterium target at the (W, Q ' ) points (2.15, 1.2) and (2.65, 2.0). The transverse cross section obtained by using these data in conjunction with earlier data at high E to separate the longitudinal and transverse components is used in ~onj~unction with the new data and the t -channel Born term to determine the pion form factor and to re-evaluate previously reported measurements. In the range 0.15 G~V~ < Q < 10.0 GeVZ the ' pion form factor can be described by the simple pole form [I + Q 2/(0.462 + 0.024)]-'.
The proton and deuteron structure functions F p 2 and F d 2 are measured in inelastic muon scattering with an average beam energy of 470 GeV. The data were taken at Fermilab experiment E665 during 1991-92 using liquid hydrogen and deuterium targets. The F2 measurements are reported in the range 0:0008 < x < 0 : 6 and 0:2 < Q 2 < 75 GeV 2. These are the rst precise measurements of F2 in the low x and Q 2 range of the data. In the high x range of the data where they overlap in x and Q 2 with the measurements from NMC, the two measurements are in agreement. The E665 data also overlap in x with the HERA data, and there is a smooth connection in Q 2 between the two data sets. At high Q 2 the E665 measurements are consistent with QCDevolved leading twist structure function models. The data are qualitatively described 2 by structure function models incorporating the hadronic nature of the photon at low Q 2. The Q 2 and the W dependence of the data measure the transition in the nature of the photon between a point-like probe at high Q 2 and a hadronic object at low Q 2 .
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