Resummation, Evolution, Factorization 2025

Session

Tuesday

14 Oct 2025, 08:45

Sala Consiglio (Physics Department, Milan University)

48. Implementation of TMD non-perturbative effects in RadISH

Yiyu Zhou (University of Turin)

14/10/2025, 08:45

In this work, we incorporate transverse momentum dependent (TMD) non-perturbative (NP) effects into the RadISH framework.
By accounting for these effects, we achieve an improvement in the theoretical description of the Drell-Yan cross section at low $p_{T, \ell \ell}$ (the transverse momentum of the final-state lepton pair).
A similar effect is observed in the $\phi_{\eta}^*$ differential...

9. On the PB Sudakov: NNLL coefficient, CS kernel and intrinsic-kt

Aleksandra Lelek (University of Antwerp)

14/10/2025, 09:10

The TMD Parton Branching (PB) method was developed to include elements of the TMD physics in MC generators. Its relation to stringent CSS formalism remained initially unclear. In this talk, we shed light on the relation of the PB Sudakov form factor to that of CSS. We discuss both perturbative and non-perturbative components. We present recent developments to include NNLL coefficient in the PB...

53. TMD evolution and intrinsic k_T in MC generators

Louis Moureaux (Universität Hamburg)

14/10/2025, 09:35

The parton branching (PB) method allows using TMD evolution with standard
Monte Carlo event generators, replacing the current approximate treatment of initial state radiation with a rigorous prediction from first principles. A key parameter of PB is the intrinsic $k_\mathrm T$, which governs the low-scale behaviour of the TMD. In its first extraction from collider data, tensions appeared...

14. First Neural-Network Extraction of Unpolarized Transverse-Momentum-Dependent Distributions

Dr Matteo Cerutti (CEA Paris-Saclay)

14/10/2025, 10:30

We present the first extraction of transverse-momentum-dependent distributions of unpolarized quarks from experimental Drell-Yan data using neural networks to parametrize their nonperturbative part. We show that neural networks outperform traditional parametrizations providing a more accurate description of data. This work establishes the feasibility of using neural networks to explore the...

12. On the sensitivity of energy-energy correlation to TMD dynamics

Alejandro Bris (Universidad Complutense Madrid - IPARCOS)

14/10/2025, 10:55

The transverse momentum dependent factorization framework provides for energy-energy correlation in the back-to-back limit the highest order result ever achieved in perturbation theory: N$^4$LL+N$^3$LO.

We implemented this setup, using the $\zeta$-prescription within ARTEMIDE's code, to study the possibilities of obtaining information on the Collins-Soper kernel and the strong coupling...

31. Kinematic Power Corrections in TMD factorization

Sara Piloñeta (Complutense University of Madrid)

14/10/2025, 11:20

In this talk, I present a study of Drell-Yan (DY) and semi-inclusive deep inelastic scattering (SIDIS) structure functions within the framework of the transverse momentum dependent (TMD) factorization theorem, including kinematic power corrections (KPCs). This formalism enables us to describe parts of the cross-section that were previously inaccessible to theory in a Lorentz-invariant manner...

37. New insights on partonic Sivers distribution

Filippo Delcarro (Istituto Nazionale di Fisica Nucleare)

14/10/2025, 11:45

We present an extraction of Sivers TMDs from an updated set of DY and SIDIS asymmetries using the MAP framework

34. Generalization of collinear factorization in perturbative QCD

Prasanna Kumar Dhani (University of Zurich)

14/10/2025, 15:45

We consider the most general factorization properties of scattering amplitudes in perturbative QCD in both collinear and collinear-soft limits. While scattering amplitudes obey strict collinear factorization (SCF) in the time-like collinear region to all perturbative orders, SCF is known to break in the so-called space-like collinear region. We generalize previously known results of SCF...

23. Low-energy theory of jet processes and PDF factorization

Dominik Schwienbacher (University of Bern)

14/10/2025, 16:10

Factorization theorems for non-global observables at hadron colliders can be used to resum super-leading logarithms (SLLs). These SLLs are closely related to collinear factorization breaking and are driven by a double-logarithmic evolution equation in an effective field theory. The compatibility of this double-logarithmic evolution with single-logarithmic PDF evolution at low scales implies...

46. How RHIC can inform the EIC science

Elke-Caroline Aschenauer (BNL)