Exclusive production of heavy quarkonia as a probe of the low x and low scale gluon PDF
Abstract
We discuss the exclusive J/ photoproduction process, as measured recently at LHCb, as a means of constraining and ultimately determining the low x and low Q gluon PDF. The scale dependence of the theoretical prediction for this process is shown to be systematically improved via a taming of the known MS result, this amounts to resumming logarithmically enhanced small-x terms and implementing a small-Q power correction. The cross section level predictions allow the behaviour of the gluon PDF in the low (x, Q) domain to be determined.
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