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Volume 352 - XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2019) - Working Group 2: Low-x and Diffraction
Towards a determination of the low $x$ gluon via exclusive $J/\psi$ production
C. Flett,* S. Jones, A. Martin, M.G. Ryskin, T. Teubner
*corresponding author
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Pre-published on: 2019 July 03
Published on: 2019 October 04
We discuss how the stability of the theoretical prediction for exclusive $J/\psi$ photoproduction has been improved through a systematic taming of the known $\overline{\text{MS}}$ coefficient functions by accounting for a formally power suppressed, but numerically significant, correction
encoded within a $Q_0$ cut. The phenomenological implications of this will be emphasised meaning, ultimately, the possibility to include the exclusive data into a global fitter framework to provide constraints on the small $x$ gluon.
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