Abstract
Quark fragmentation functions are studied in charged current ν and ν interactions in deuterium. The W 2, Q 2 and y dependences are compared with the predictions of first order QCD and with those of higher twists. The W 2 dependence is a small effect in our kinematical range and our data are well linked to the higher W 2 muon scattering experiment. The Q 2 dependence of non singlet fragmentation functions is well reproduced by first order QCD but part of this dependence could be due to some low W kinematical effect. The y- z factorization breaking seems to be a low W effect but a small higher twist term, as predicted by Berger cannot be excluded.
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