Measurement of semi-inclusive pi(+) electroproduction off the proton
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Osipenko-2009-Measurement of semi-.pdf
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1.55 MB
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Author(s)
Skabelin, Alexander V.
Date Issued
August 2009
Journal
Physical review D
Publisher
American Physical Society
Citation
Osipenko, M. et al. “Measurement of Semi-inclusive Π+ Electroproduction Off the Proton.” Physical Review D 80.3 (2009) : n. pag. © 2009 The American Physical Society
Version
Final published version
Abstract
Semi-inclusive π+ [pi superscript +] 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, ϕ [phi], enabling us to separate the ϕ-dependent [phi-dependent] terms. Our measurements of the ϕ-independent [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 π+ [pi superscript +] 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- [e superscript + e superscript -] collisions. We have observed that the two ϕ-dependent [phi-dependent] terms of the cross section are small. Within our precision the cos2ϕ [cos 2 phi] term is compatible with zero, except for the low-z region, and the measured cosϕ [cos phi]term is much smaller in magnitude than the sum of the Cahn and Berger effects.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.80.032004
