The University of Southampton
University of Southampton Institutional Repository

Power corrections in deep inelastic structure functions at large Bjorken x

Record type: Article

We study power corrections to the spin-averaged structure functions F2 and FL in the semi-inclusive region. The dramatic breakdown of the operator product expansion at large Bjorken x due to the formation of a narrow jet with invariant mass W (W2=Q2(1?x)/x) calls for an alternative approach. Our main conjecture is that the dominant contribution at each twist is the one which mixes under renormalization with the leading twist (ultraviolet dominance). At twist two the dominant perturbative corrections at large x due to soft and collinear radiation can be factorized into a jet function. From the ultraviolet dominance conjecture it follows that the twist two parton distribution as well as the jet function actually factorize to any order in the twist expansion. This factorization suggests that non-perturbative corrections 1/W2n exponentiate together with the leading twist. We verify explicitly, at the level of a single dressed gluon, the cancellation between ambiguities due to infrared renormalons in the twist-two coefficient functions and those due to the ultraviolet divergence of twist-four matrix elements. Independently of the renormalon analysis, we show that the dominant contribution to twist four at large x is associated with a twist-two like configuration: the final states are identical to those of twist two, whereas the initial states differ just by additional partons carrying small momentum fractions. This picture is consistent with the ultraviolet dominance conjecture.

Full text not available from this repository.


Gardi, E., Korchemsky, G.P., Ross, D.A. and Tafat, S. (2002) Power corrections in deep inelastic structure functions at large Bjorken x Nuclear Physics B, 636, (1-2), pp. 385-417. (doi:10.1016/S0550-3213(02)00406-6).

More information

Published date: 5 August 2002
Organisations: Physics & Astronomy


Local EPrints ID: 37995
ISSN: 0550-3213
PURE UUID: 3ddfccdb-be3e-499f-b334-5256d9ac2916

Catalogue record

Date deposited: 26 May 2006
Last modified: 17 Jul 2017 15:40

Export record



Author: E. Gardi
Author: G.P. Korchemsky
Author: D.A. Ross
Author: S. Tafat

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.