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20 April 2024

» arxiv » 1912.9128

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Exclusive production of heavy quarkonia as a probe of the low x and low scale gluon PDF
C. A. Flett ; S. P. Jones ; A. D. Martin ; M. G. Ryskin ; T. Teubner ;
Date:	19 Dec 2019
Abstract:	We discuss the exclusive $J/psi$ 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 $ar{ ext{MS}}$ 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.
Source:	arXiv, 1912.9128
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