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arXiv · 2609.35344

Resummation-scale uncertainties in PDF determinations

Hamed Abdolmaleki·Valerio Bertone·Giuseppe Bozzi·Francesco Giuli·Alexander Glazov·Valentina Guglielmi·Francesco Hautmann·Fred Olness·Pavel Starovoitov·Oleksandr Zenaiev
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Abstract

We investigate the impact of resummation-scale variations on parton distribution function (PDF) determinations. These variations introduce an additional source of theoretical uncertainty related to the evolution of PDFs and strong coupling $α_s$ that has never previously been accounted for in PDF fits. Using the open-source xFitter framework, we quantify this uncertainty in fits to HERA deep-inelastic scattering data and examine its implications for predictions of top-quark pair production at the LHC. We show that the resulting resummation-scale uncertainties have a sizable impact on LHC observables, highlighting the importance of including this source of uncertainty in precision QCD analyses.

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Hamed Abdolmaleki, Valerio Bertone, Giuseppe Bozzi, Francesco Giuli, Alexander Glazov, Valentina Guglielmi, Francesco Hautmann, Fred Olness, Pavel Starovoitov, Oleksandr Zenaiev. 2026-09-28. Resummation-scale uncertainties in PDF determinations. https://arxiv.org/abs/2609.35344

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