Power-like corrections and the determination of the gluon distribution
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 multi-gluon contributions in powers of 1/Q2. We find a moderate, negative correction to the structure function's derivative d F2 / d Q2, characterized by a slow fall-off in the region of low to medium Q2 relevant for determinations of the gluon at small momentum fractions.
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