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Currently, the gluon distribution function is mainly constrained by jet data.Yet, its high-x behaviour is largely unknown. This kinematic region isimportant, for instance, for the understanding of the production of a massivestate at forward rapidities at the LHC. In the past, single inclusive directphoton data from fixed target experiments was used to constrain the gluondistribution due to its dominant contribution from the $qg \rightarrow\gamma q$subprocess in proton-proton collisions. Due to disagreement with itstheoretical predictions at next-to-leading order (NLO) in perturbative QCD(pQCD), direct photon data have been excluded from global fits. This talk willdiscuss an improvement to such theoretical predictions by including\emph{threshold resummation} at next-to-leading logarithmic accuracy (NLL) andits impact on gluon distribution at large-x using Bayesian reweightingtechnique.

Threshold resummation in direct photon production and its implications on the large-x gluon PDF