Parton Showers and Resummation 2025

Session

Parton densities and soft resummation

15 Jul 2025, 16:00

500/1-001 - Main Auditorium (CERN)

9. Four-top production at the LHC: improving predictions with invariant-mass threshold resummation.

Tommaso Saracco (Nikhef)

15/07/2025, 16:00

We present new results for the invariant-mass distribution and total cross section for four-top production, incorporating the resummation of soft-gluon corrections at improved next-to-leading logarithmic accuracy, including non-logarithmic $\mathcal{O}(\alpha_s)$ terms (NLL’ accuracy). After discussing the challenges of invariant-mass threshold resummation in processes with six coloured legs,...

4. Factorization and Resummation in Threshold PDFs

Marvin Schnubel (BNL)

15/07/2025, 16:30

We study factorization at next-to-leading power (NLP) in deep inelastic scattering (DIS) in the endpoint region $x\to1$ within the framework of soft-collinear effective theory (SCET). The full QCD process is matched onto two SCET currents, whose matrix elements factorize into individual component functions. By employing endpoint reshuffling theorems that relate these component functions at...

8. Threshold resummation for VV pair production to NNLO+NNLL at the LHC (Zoom)

Vaibhav Pandey (Indian Institute of Technology Guwahati)

15/07/2025, 17:00

We perform the threshold resummation for massive vector boson pair production processes ($ZZ$ and $W^{+}W^{-}$) in hadron collisions to Next to Next Leading Log accuracy. The resummed cross-sections are then matched with NNLO fixed order results, which are obtained using the MATRIX code. We present our results for the invariant mass distribution to NNLO+NNLL accuracy in QCD for the current LHC...

12. Large-x Resummation for Transverse Momentum Distributions

Óscar del Río García (Complutense University of Madrid)

15/07/2025, 17:30

In this talk, I discuss the resummation of leading logarithmic contributions to the collinear matching coefficients of Transverse Momentum Dependent distributions (TMDs) in the large-$x$ regime. Resummation is performed directly at the level of TMDs, preserving their process-independence and, for the first time, covering distributions that match onto twist‑three collinear Parton Distribution...

5. Small-x Resummed Gluon Densities from HELL and Applications with JETHAD (Zoom)

Dr Francesco Giovanni Celiberto (UAH Madrid)

15/07/2025, 18:00

We review the state of the art in applying the small-x resummation to parton distribution functions in the proton, with particular emphasis on the gluon content. In the first part, we briefly discuss small-x resummed 1D collinear distributions, highlighting their connections with the 3D transverse-momentum dependent counterparts at both small and moderate x, including the effects of...