Measurement of semi-inclusive pi(+) electroproduction off the proton
Author(s)
Skabelin, Alexander V.
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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.
Date issued
2009-08Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
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
ISSN
1550-7998
1550-2368