Impact of higher order and soft gluon corrections on the extraction of higher twist effects in DIS

The impact of recently calculated next-to-next-to-leading order QCD correct ions and soft gluon resummations on the extraction of higher twist contribu tions to the deep-inelastic structure function F-2 is studied using the BCD MS and SLAC data. It is demonstrated to which extent the need for higher tw ist terms is diminishing due to these higher order effects in the kinematic al region, 0.35 less than or equal to x less than or equal to 0.85 and Q(2) > 1.2 GeV2, investigated. In addition, theoretical uncertainties in the ex traction of higher twist contributions are discussed, and comparisons to re sults obtained previously are made. (C) 2001 Elsevier Science B.V. All righ ts reserved.