Resummation, Evolution, Factorization 2025

Session

Monday

13 Oct 2025, 14:15

Sala Consiglio (Physics Department, Milan University)

17. Energy Correlators in High Energy Nuclear Physics

Joao Barata (CERN)

13/10/2025, 14:15

In recent years, energy-flow (light-ray) operators have emerged as a common language linking theory and experiment for mapping the dynamics of quantum field theories. In this talk, I will survey how multi-point energy correlators are used to characterize QCD matter in high-energy scattering, with emphasis on processes involving nuclear targets. I will review the theoretical status of light-ray...

21. Quantum Scaling in Energy Correlators: Perturbative and Non-perturbative Aspects

Hao Chen

13/10/2025, 14:40

In this talk, I will first review the collinear factorization of energy correlators in perturbative QCD and introduce the light-ray operator product expansion formalism. We generalize this framework to describe both hadronization corrections in the pre-confinement (perturbative) regime as well as the post-confinement (free hadron) regime. Based on these results, we will propose a conjecture...

2. TMDs: Twist-2 Matching, Observables, and High-Energy Evolution

Yu Jiao Zhu (Max-Planck Institute for Physics)

13/10/2025, 15:05

We report on the N3LO twist-2 matching of polarized TMDs along with all N3LO polarized DGLAP kernels. Various qt-observables such as SIDIS qt, lepton-jet TEEC and dijet-TEEC are obtained at N3LL accuracy. Work towards precision small-x physics is also addressed based on Liptov Reggeon Field Theory and Glauber SCET.

41. On the N3LO contributions to the PDF scale evolution

Giulio Falcioni (University of Torino and University of Zürich)

13/10/2025, 16:00

The four-loop DGLAP splitting functions are a key ingredient to control the scale evolution of the PDFs to N3LO accuracy in QCD. I present results for the first 10 moments of the four-loop splitting functions. I discuss the approximate N3LO PDF evolution, based on the computed moments and on the known information on the asymptotic limits of the splitting functions, and its relevance for LHC physics.

8. Perturbative RGE systematics in precision observables

Giuseppe Bozzi (University of Cagliari and INFN, Cagliari)

13/10/2025, 16:25

QCD calculations for collider physics make use of perturbative solutions of renormalisation group equations (RGEs). Ambiguities related to these solutions can contribute significantly to systematic uncertainties of theoretical predictions for physical observables.
We propose a general method to estimate these systematic effects using techniques inspired by soft-gluon and transverse-momentum...

3. N$^{3}$LO fits to DIS HERA data using the xFitter framework

Dr Francesco Giuli (Istituto Nazionale di Fisica Nucleare)

13/10/2025, 16:50

We investigate the impact of recently computed N$^{3}$LO corrections to QCD splitting and DIS coefficient functions on global fits of Parton Distribution Functions (PDF) using the xFitter framework. By comparing fits performed at different perturbative orders, we analyze the modifications introduced to PDFs and their associated uncertainties, incorporating correlated experimental errors....