Measurement of semi-inclusiveπ+electroproduction off the proton

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Abstract

Semi-inclusive ${\ensuremath{\pi}}^{+}$ 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, $\ensuremath{\phi}$, enabling us to separate the $\ensuremath{\phi}$-dependent terms. Our measurements of the $\ensuremath{\phi}$-independent term of the cross section at low Bjorken $x$ were found to be in fairly good agreement with pQCD calculations. Indeed, the conventional current fragmentation calculation can account for almost all of the observed cross section, even at small ${\ensuremath{\pi}}^{+}$ momentum. The measured center-of-momentum spectra are in qualitative agreement with high-energy data, which suggests a surprising numerical similarity between the spectator diquark fragmentation in the present reaction and the antiquark fragmentation measured in ${e}^{+}{e}^{\ensuremath{-}}$ collisions. We have observed that the two $\ensuremath{\phi}$-dependent terms of the cross section are small. Within our precision the $\mathrm{cos}2\ensuremath{\phi}$ term is compatible with zero, except for the low-$z$ region, and the measured $\mathrm{cos}\ensuremath{\phi}$ term is much smaller in magnitude than the sum of the Cahn and Berger effects.

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