Fragmentation functions in high energy ν and deuterium interactions

Quark fragmentation functions are studied in charged current ν and ν interactions in deuterium. The W2, Q2 and y dependences are compared with the predictions of first order QCD and with those of higher twists. The W2 dependence is a small effect in our kinematical range and our data are well linked to the higher W2 muon scattering experiment. The Q2 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.