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

Understand

Semi-inclusive pi+ electroproduction on protons has been measured with the CLAS detector at Jefferson Lab.

• The measurement was performed on a liquid-hydrogen target using a 5.75 GeV electron beam.
• The complete five-fold differential cross sections were measured over a wide kinematic range including the complete range of azimuthal angles between hadronic and leptonic planes, phi, enabling us to separate the phi-dependent terms.
• Our measurements of phi-independent term of the cross section at low Bjorken x were found to be in fairly good agreement with pQCD calculations.