High-twist contribution to the longitudinal
FL at high x
Institute for High Energy Physics, Protvino, 142284, Russia
Received: 21 April 1999 / Revised version: 17 June 1999 /
Published online: 27 January 2000 - © Springer-Verlag 2000 2000
We perform the NLO QCD fit to the combined deep inelastic scattering (DIS) data at high x from the SLAC, BCDMS, and NMC collaborations. The model-independent x shape of the high-twist contribution to structure function FL is extracted. The twist-4 contribution to FL is found to be in a qualitative agreement with the predictions of the infrared renormalon model. The twist-6 contribution exhibits a weak trend to negative values, although on the whole, it is compatible with zero within the errors.
Copyright Springer-Verlag 2000