Higher Twist Contributions to the Structure Functions F_2^p(x,Q^2) and F_2^d(x,Q^2) at Large x and Higher Orders

Paper

Abstract

The higher twist contributions to the deeply inelastic structure functions

and

for larger values of the Bjorken variable

are extracted extrapolating the {twist--2} contributions measured in the large

region to the region

applying target mass corrections. We compare the results for the NLO, NNLO and N

LO analyzes and include also the large

at N

LO to the Wilson coefficients. A gradual lowering of the higher twist contributions going from NLO to N

LO is observed, which stresses the importance of higher order corrections.