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Semi-inclusive pi+ electroproduction on protons has been measured with theCLAS detector at Jefferson Lab. The measurement was performed on aliquid-hydrogen target using a 5.75 GeV electron beam. The complete five-folddifferential cross sections were measured over a wide kinematic range includingthe complete range of azimuthal angles between hadronic and leptonic planes,phi, enabling us to separate the phi-dependent terms. Our measurements ofphi-independent term of the cross section at low Bjorken x were found to be infairly good agreement with pQCD calculations. Indeed, the conventional currentfragmentation calculation can account for almost all of the observed crosssection, even at small pi+ momentum. The measured center-of-momentum spectraare in qualitative agreement with high energy data, which suggests a surprisingnumerical similarity between the spectator diquark fragmentation in the presentreaction and the anti-quark fragmentation measured in e+e- collisions. We haveobserved that the two phi-dependent terms of the cross section are small.Within our precision the cos(2phi) term is compatible with zero, except forlow-z region, and the measured cos(phi) term is much smaller in magnitude thanthe sum of the Cahn and Berger effects.

Measurement of unpolarized semi-inclusive pi+ electroproduction off the proton