Soft gluon effects in the extraction of higher twists at large Bjorken x
arXiv:hep-ph/0005315 · doi:10.1016/S0370-2693(00)01147-3
Abstract
Existing data on the (unpolarised) transverse structure function of the proton are analyzed for large values of the Bjorken variable x. The leading-twist and a phenomenological higher-twist contributions are simultaneously determined from a power correction analysis of the Nachtmann moments for values of the squared four-momentum transfer between ~ 1 and 20 (GeV/c)**2. The results obtained adopting the next-to-leading order approximation and those including the effects of soft gluon resummation are compared. The sensitivity of the extraction of large-x higher twists to high-order radiative corrections as well as to the value of alphas(MZ) is illustrated.
revised version to appear in Phys. Lett. B: discussion of higher-twist models included; misprints in Eq. (1) and (10) corrected