QCD@LHC 2026

Session

Joint: New techniques & High-scale QCD

1 Oct 2026, 09:00

University of Oxford

110. Monte Carlo Event Generator Modelling and Validation with Jet Measurements in CMS

Jennifer Roloff (Brown University (US))

01/10/2026, 09:00

1

Joint: New techniques & High-scale QCD

Standard slot

The large data set collected by the CMS experiment during Run 3 enables studies of proton-proton collisions with unprecedented precision. Achieving comparable accuracy in simulation therefore requires a detailed understanding and careful validation of Monte Carlo (MC) event generators. In CMS, the hard-scattering process is typically simulated using generators such as MadGraph5_aMC@NLO and...

88. Gauge-Invariant Longitudinal Modes in the Herwig 7 Electroweak Parton Shower (REMOTE)

Aidin Masouminia (IPPP, Durham University)

01/10/2026, 09:20

Joint: New techniques & High-scale QCD

Standard slot

I will present a gauge-invariant treatment of longitudinal electroweak radiation in the Herwig 7 angular-ordered electroweak parton shower. In the broken Standard Model, the gauge component of a longitudinal polarisation is related by Ward identities to the corresponding would-be Goldstone mode, so a consistent shower description requires more than a purely subtraction-based prescription....

130. Recent progress on logarithmic accuracy in PanScales

Keith Hamilton (University College London (GB))

01/10/2026, 09:40

Joint: New techniques & High-scale QCD

Standard slot

This talk will present recent progress on demonstrable logarithmic accuracy in the PanScales parton shower project. It will discuss NNLL showers for colour-singlet processes with initial-state hadrons, and the extension of NNLL accuracy for event-shape-like and non-global observables to both PanGlobal and PanLocal showers, in a framework that consistently includes spin correlations. Finally,...

104. Recent jet substructure measurements in CMS

Attila Jozsef Radl (HUN-REN Wigner Research Centre for Physics (HU))

01/10/2026, 10:00

2

Joint: New techniques & High-scale QCD

Standard slot

Measurements of jet substructure in proton-proton collisions at theLHC provide stringent tests of QCD, improve our understanding of parton showering and hadronization, and offer important tools for searches for physics beyond the Standard Model. We present recent jet substructure measurements performed by the CMS Collaboration and compare the results with a range of theoretical predictions and...

114. Jet fragmentation and colour reconnection studies with CMS at √s = 13 TeV

Attila Jozsef Radl (HUN-REN Wigner Research Centre for Physics (HU))

Joint: New techniques & High-scale QCD

Standard slot

Measurements of the internal structure of jets in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13~\mathrm{TeV}$ provide detailed tests of jet fragmentation modelling. We will present results using data recorded by the CMS detector during the Run 2 data-taking period to evaluate the performance of colour reconnection and hadronisation models implemented in Monte Carlo event...