Abstract
Abstract Power-suppressed corrections to parton evolution may affect the theoretical accuracy of current determinations of parton distributions. We study the role of multigluon-exchange terms in the extraction of the gluon distribution for the large hadron collider (LHC). Working in the high-energy approximation, we analyze multigluon contributions in powers of 1 / Q 2 . We find a moderate, negative correction to the structure function's derivative d F 2 / d ln Q 2 , characterized by a slow fall-off in the region of low to medium Q 2 relevant for determinations of the gluon at small momentum fractions.
Highlights
The estimate of the theoretical accuracy on the determination of parton distributions is relevant for phenomenology at the large hadron collider (LHC) [1,2,3]
We concentrate on the power correction Δ to the Q2 derivative of the structure function F2 d F2 d ln Q2
Where K is the perturbative kernel, G is the gluon distribution, and Δ is O(1/Q2). This correction contributes to the theory uncertainty on G, since below x 10−2 this is mostly determined from data for dF2/d ln Q2
Summary
The estimate of the theoretical accuracy on the determination of parton distributions is relevant for phenomenology at the large hadron collider (LHC) [1,2,3]. The extraction of the gluon distribution for small momentum fractions depends on data in the region of high energies and moderate to low Q2, in which power-like corrections from multiple parton scatterings are potentially significant. We concentrate on the power correction Δ to the Q2 derivative of the structure function F2 d F2 d ln Q2
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