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Updated: May 11, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
A method to include exclusive heavy vector-meson production data at small x in global parton analyses
C A Flett1, A D Martin2, M G Ryskin3
1Université Paris-Saclay, CNRS, IJCLab, 91405 Orsay, France.
Abstract:
We propose a method which allows the inclusion of exclusive heavy vector-meson production data at low x in future global parton analyses. As an example we perform a study within xFitter to determine the gluon parton distribution function (PDF) at next-to-leading order (NLO) at moderate-to-low x using the measurements of exclusive production in ep and pp collisions from HERA and LHC. We further study the constraints from the corresponding production process. We finish by discussing the possible effects at next-to-next-to-leading order (NNLO) through incorporation of a K factor for the exclusive heavy vector-meson coefficient function at NLO.
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