Conveners
Talks: Wednesday 1
- Caterina Doglioni (The University of Manchester (GB))
Talks: Wednesday 2
- Caterina Doglioni (The University of Manchester (GB))
Talks: Wednesday 3
- Mike Seymour (The University of Manchester (GB))
Talks: Wednesday 4
- Silvia Zanoli (University of Oxford)
Talks: Thursday 1
- Jack Helliwell (Monash University (AU))
Talks: Thursday 2
- Jack Holguin (The University of Manchester)
Talks: Thursday 3
- Emmet Byrne (The University of Manchester)
Talks: Friday 1
- Jonathan Richard Gaunt (University of Cyprus (CY))
Talks: Friday 2
- Jonathan Richard Gaunt (University of Cyprus (CY))
Talks: Friday 3
- Simone Marzani (Universitร di Genova and INFN Sezione di Genova)
Talks: Friday 4
- Saad Nabeebaccus (University of Manchester)
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Jonathan Butterworth (UCL)08/07/2026, 09:15
With the HL-LHC on its way, and FCC-ee on the horizon, we are entering an era of precision collider physics, motivated not only by probing the limits of the Standard Model, but by looking for clues as to a bigger theory that contains it. The improved calculational techniques under discussion at this meeting will be critical. However, issues such as reproducibility of analyses, reliability of...
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Leticia Cunqueiro Mendez (Roma Sapienza University)08/07/2026, 10:05
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Jennifer Roloff (Brown University (US))08/07/2026, 11:00
As the accuracy of experimental results increases in high energy physics, so too must the precision of Monte Carlo simulations. Currently, event generation at next-to-leading order (NLO) accuracy in QCD and beyond results in the production of negatively-weighted events. The presence of these weights increases strain on computational resources by degrading the statistical power of MC samples,...
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James Whitehead08/07/2026, 11:25
Monte Carlo Event Generators form a bridge between the Standard Model Lagrangian and collider measurements. To do so they combine complementary approximations and models across all scales: fixed-order perturbation theory for the hard scattering, matching to or merging with the parton shower, the semi-classical shower itself for the cascade, and semi-empirical models of hadronisation and MPI....
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Siddharth Sule (The University of Manchester (GB))08/07/2026, 13:30
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Simon Platzer (University of Graz (AT))08/07/2026, 13:55
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Zoltan Nagy08/07/2026, 14:20
The parton shower beyond the leading order is the next step to improve our
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understanding of hadronic final states in collider experiments. This is rather challenging since we have to deal with
more Feynman graphs and more complicated integrals. At first order level the parton shower algorithm is rather
intuitive but higher order level the quantum interference are more important and... -
Hannah Bossi (Massachusetts Inst. of Technology (US))08/07/2026, 14:45
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Joanne Roper (Durham University)08/07/2026, 15:40
Parton showers are an essential feature of event generation that provide a numerical resummation of the large logarithms that enhance soft and collinear radiation. Matching them to higher order calculations requires careful treatment in order to avoid double-counting real radiation and preserve fixed order accuracy through matching algorithms such as MC@NLO. As we approach HL-LHC, there is a...
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Daniel Reichelt (CERN)08/07/2026, 16:05
In this talk I will discuss a new technique for the next-to-leading order accurate simulation of $e^+e^- \to t\bar{t}$ that respects the resonant nature of the process above and near the top-quark pair production threshold.
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Standard parton shower simulations do not account for resonances appearing in the hard process when simulating the radiation of soft gluons from external legs, neither... -
Daniele Lombardi (Universitร di Torino)08/07/2026, 16:30
The matching of NLO predictions to parton showers has long been considered a solved problem. However, it has recently attracted renewed attention with the development of a new generation of parton showers capable of achieving next-to-leading logarithmic (NLL) or even higher logarithmic accuracy. This progress poses new challenges for existing matching schemes and makes it worthwhile to revisit...
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Silvia Ferrario Ravasio (Universitร degli Studi di Torino)09/07/2026, 09:15
In this talk I will discuss recent progress to ameliorate the accuracy of the PanScales showers beyond NLL for massless final states.
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In particular, I will present the inclusion of quark-mass effects and matching to fixed-order calculations. Matching is also paramout to obtain NNDL accuracy for event shapes and, combined with an improved treatment of soft radiation beyond the standard NLL... -
Nicolas Francois Schalch (University of Oxford (GB))09/07/2026, 10:05
Parton shower matching that retains logarithmic accuracy is a major challenge. We present first results beyond NLO using the PanScales framework. Focusing on $e^+e^-$ collisions, we construct a matching procedure that incorporates the full set of leading-colour double-real $\mathcal{O}(\alpha_s^2)$ contributions, in a manner consistent with the logarithmic structure of the showers. As a first...
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Prof. Simone Marzani (Universitร di Genova and INFN Sezione di Genova)09/07/2026, 11:00
It has recently been proposed that collider events can be equipped with a metric, the Energy Moverโs Distance (EMD), which allows one to rephrase multiple aspects of jet physics in a geometric language. Further, the EMD can be exploited to define new observables that measure the distance between a given event and an idealised one. For instance, event isotropy quantifies the resemblance of an...
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Terry Generet (University of Cambridge)09/07/2026, 11:25
In this talk, I will present some recent calculations of the inclusive jet transverse momentum spectrum at the LHC, performed at next-to-next-to-leading order and including resummation of logarithms of the jet radius $R$ at next-to-next-to-leading-logarithmic accuracy. Estimates of missing-higher-order uncertainties obtained from scale variations are notoriously unreliable for inclusive jet...
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Paolo Nason09/07/2026, 11:50
I present the results of a recent work, were different, yet legitimate, resummation prescriptions are considered for the calculation of the thrust distribution in e+e- collisions. In particular we consider differences in the resummation performed in the so called conjugate (Laplace transform) space with respect to the direct one, and differences that arises when certain commonly adopted...
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Einan Gardi09/07/2026, 13:30
I review recent progress in methodology and applications of the Method of Regions, the central approach to performing asymptotic expansions of Feynman integrals. In this method, general log-power expansions in singular kinematic limits are obtained through a sum over โregion integralsโ, each of which is defined by a Taylor expansion of the integrand under certain assumptions regarding the...
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Giovanni Stagnitto (INFN e Universita Genova (IT))09/07/2026, 14:20
We revisit the basic steps necessary to obtain next-to-leading-logarithmic accurate small-x results for the DGLAP splitting functions, and their implementations within the HELL framework. We derive new analytical all-order results for the leading-logarithmic gg anomalous dimension, the qg and gg finite Green functions, and most importantly for the qg anomalous dimension, which allows us to...
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Sebastian Eryk Jaskiewicz (University of Bern)09/07/2026, 14:45
In this talk, I will discuss the growing importance of controlling high-energy logarithms in predictions for LHC processes. I will highlight recent directions pursued by the High-Energy Jets collaboration: Higgs boson plus quark-pair production as a background to di-Higgs searches, isolated photon plus jets, and Z plus dijets.
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Patrick Angus Hager10/07/2026, 09:15
Factorisation theorems underpin essentially all precision predictions at hadron colliders. Yet, for a broad class of observables, collinear factorisation is known to fail at the amplitude level. I review the current understanding of (soft-)collinear factorisation and the origin of its breaking, before discussing a recently identified mechanism through which PDF factorisation can nevertheless...
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Andrea Banfi (University of Sussex)10/07/2026, 10:05
When performing resummation of global rIRC safe observables, it is often assumed that gluons at wide angles feel the total colour charge of collinear particles. We show that this is not the case for one-jettiness, an observable which was believed to enjoy an all-order factorisation formula. In fact, due to the presence of Coulomb gluons, one-jettiness exhibits super-super-leading logarithms, a...
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Dominik Schwienbacher10/07/2026, 11:00
I derive a novel factorization theorem for N-jettiness at hadron colliders, which incorporates coherence-violating effects induced by Glauber gluons and several new momentum modes. Their interplay generates coherence-violating logarithms (CVLs) starting at four-loop (Nโฅ1) or five-loop order (N=0). I calculate the anomalous dimensions required for the resummation of CVLs and establish a general...
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Saad Nabeebaccus (University of Manchester)10/07/2026, 11:25
In this talk, I will discuss a class of non-global observables in which one vetoes transverse-energy flow inside an azimuthal interval $\Delta \phi$ defined with respect to a suitable reference axis. Such vetoes are widely used in measurements involving missing transverse momentum at the LHC and probe a kinematic regime that has not previously been explored. We show that these observables...
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Josua Scholze10/07/2026, 11:50
We study subleading contributions to super-leading logarithms (SLLs) arising from two soft emission operators.
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For the case of one Glauber insertion, we compute the full color structure and scale integrals, and characterize the corresponding angular integrals.
At this level of accuracy, for the first time, we are able to investigate the interplay of non-global and super-leading... -
Dr Aditya Pathak (DESY)10/07/2026, 13:30
We demonstrate Reggeization associated with Glauber gluon exchanges in the strict collinear factorization violating pieces in the space-like splitting amplitudes featuring aspects of both forward ย and hard scattering. We find that by exploiting contour deformation away from the Glauber region wherever possible the collinear subgraphs defined in the effective theory can be computed without...
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Jack Holguin (The University of Manchester)10/07/2026, 13:55
Energy correlators admit a dual description as light-ray operators obeying an operator product expansion on the celestial sphere. I give a pedagogical introduction to the light-ray OPE and its misconceptions, then show that inclusive jet cross-sections are also light-ray measurements. Using the OPE, I derive the small-R jet factorisation theorem, pin down the scaling of hadronisation and...
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Carlota Andres (CPHT, Ecole polytechnique)10/07/2026, 14:20
Correlation functions of generalized detectors provide a broad class of measurements relevant for heavy-ion jets, including the well-known energyโenergy correlator (EEC), its energy-squared variant (E2E2C), and charged energy correlators. In this talk, we show that correlators of generalized detectors admit a universal theoretical description based on the light-ray operator product expansion...
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Andrea Ghira (TUM)10/07/2026, 14:45
In this talk, I will present recent resummed and matched predictions at next-to-leading logarithmic (NLL) accuracy for heavy-flavour jet substructure. I will also discuss recent developments aimed at extending these calculations to higher logarithmic accuracy in the resummation framework.
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Luca Buonocore (CERN)10/07/2026, 15:40
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Emmet Byrne (The University of Manchester)10/07/2026, 16:05
Over the past several years, a collection of techniques have enabled the efficient computation of new soft and beam functions at N$^2$LO. In this talk, I show how we have used some of those techniques to compute new soft functions at N$^2$LO, firstly for generalised event shapes at $e^+ e^-$ colliders, and secondly for the measurement of boson transverse momentum along with a...
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Rudi Rahn (University of Vienna)10/07/2026, 16:30
The analytic, factorisation based, resummation of non-global logarithms requires ingredient functions of higher computational complexity than their global counterparts, due to the disparate treatment of different phase space regions, thus necessitating numerical evaluation. In this talk I will present progress towards automating the calculation of soft functions for non-global observables to...
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