We performed NLO QCD fit of combined SLAC/BCDMS/NMC DIS data at high x. Model independent x-shape of high twist contribution to structure function FL is extracted. Twist-4 contribution is found to be in fair agreement with the predictions of infrared renormalon model. Twist-6 contribution exhibits weak tendency to negative values, although in the whole is compatible with zero within errors.
@article{arxiv.hep-ph/9902241,
title = {High twist contribution to the longitudinal structure function $F_L$ at high $x$},
author = {Alekhin Sergey},
journal= {arXiv preprint arXiv:hep-ph/9902241},
year = {2011}
}