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26/08/2026, 13:25
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Elke Aschenauer26/08/2026, 13:30
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Brian Andrew Cole (Columbia University (US))26/08/2026, 14:15
Ultra-peripheral heavy ion collisions occur in ultra-relativistic nuclear scatterings with impact parameters larger than the sum of the nuclear radii. In these collisions, the hadronic interactions between the nuclei are highly suppressed and the scatterings involve energetic photons emitted by one or both nuclei. At the LHC the photon fluxes are sufficiently large at high energies to provide...
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Andreas Papaefstathiou (Kennesaw State University (US))26/08/2026, 15:30
This talk will present a brief overview of recent developments in the Herwig 7 Monte Carlo event generator, focusing on improvements related to parton showers and hadronization. The main focus will be a new next-to-leading-order treatment of polarized deep inelastic scattering that includes spin correlations in the parton shower. I will show how these effects can influence predictions at...
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Dr Ilkka Helenius (University of Jyväskylä)26/08/2026, 16:00
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FRANK KRAUSS26/08/2026, 16:30
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Daniele Massaro (CERN)26/08/2026, 17:00
The High-Luminosity LHC (HL-LHC) upgrade presents new challenges to the computing infrastructure of the LHC experiments. Monte Carlo event generation is projected to account for 10–20% of total CPU usage at ATLAS and CMS, making the speed-ups of these tools a more pressing requirement.
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MadGraph7, the next major release of the MadGraph5_aMC@NLO framework, addresses this challenge via a... -
Daniel Reichelt (CERN), Daniel Reichelt27/08/2026, 09:00
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Allen Cris John Rubesh Rajan (University College Dublin)27/08/2026, 09:30
MadGraph5_aMC@NLO is a widely used general-purpose event generator whose NLO framework has until now been restricted to symmetric hadronic collisions. With the Electron-Ion Collider era approaching, we present an implementation of direct photoproduction at NLO, as well as an asymmetric collision framework that enables resolved photoproduction at NLO. We present results for single and double...
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Alexander Feike27/08/2026, 10:00
Photon-induced processes will be a key production mechanism at the approved EIC. With this
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renewed interest, the demand for precise predictions from state-of-the-art Monte Carlo
generators has increased. In this talk, I will present recent efforts to develop a POWHEG-BOX
extension for simulating photoproduced dijets, including both direct and resolved photon
contributions based on the... -
Albi Kerbizi (Universita e INFN Trieste (IT)), Albi Kerbizi27/08/2026, 11:00
The string+3P0 model is an extension of the Lund string Model that includes the quark spin degree of freedom at the amplitude level and is capable of reproducing spin effects in hadronization such as the Collins effect and the dihadron asymmetries. It is interfaced to the Pythia event generator via the StringSpinner package for deep inelastic scattering (DIS) and e+e- annihilation to hadrons....
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Ignacio Borsa27/08/2026, 11:30
We present a Monte-Carlo program for the simulation of polarized deep inelastic scattering at next-to-leading order in QCD matched to parton shower programs building on an existing implementation of the unpolarized case in the POWHEG BOX package. We discuss extensions of the POWHEG BOX framework necessary to account for polarized initial states and validate the code by detailed comparisons to...
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Christian Preuss (University of Goettingen)27/08/2026, 12:00
I will review recent work in Pythia relating to higher-order corrections and logarithmically accurate parton showers in Pythia. On the one hand, I will present a new fully-internal multiplicative NLO matching for DIS processes, which has been applied to both the Pythia simple shower with dipole recoil and the Vincia antenna shower. On the other hand, I will discuss progress on the Apollo...
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Madhav Chithirasreemadam27/08/2026, 13:30
Precise determination of the partonic structure of real photons has attracted renewed interest in view of ongoing studies of high-energy photon-induced processes in ultraperipheral collisions (UPCs) at the Large Hadron Collider (LHC) and at the future Electron-Ion Collider (EIC).
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Despite being fundamental in their own right and essential for QCD phenomenology of hard processes initiated by... -
Vithyaban Anjelo Narendran (University of Oxford (GB))27/08/2026, 14:00
We present our progress towards a new determination of resolved-photon parton distribution functions using particle-level event-generator tuning techniques. We use Sherpa, Rivet and Professor to fit photon PDFs directly to HERA and LEP measurements, using PDF reweighting to sample the parameter space while retaining full PS and hadronisation effects. Since our previous presentations, the...
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Peter Meinzinger (Zürich University)27/08/2026, 14:30
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Constantina Sporleder (University of Jyvaskyla (FI))27/08/2026, 15:30
At HERA energies ($E_{CM}\approx 320$ GeV), around ten per cent of events in electron-proton collisions are of diffractive nature. Inspired by Regge theory and the Ingelman-Schlein picture, diffractive events in Pythia are modeled via a pomeron exchange, which is treated as a particle with a parton distribution function (PDF). The diffractive part of the PDF is given by a convolution of the...
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Vithyaban Anjelo Narendran (University of Oxford (GB))27/08/2026, 16:00
Precise modelling of hadronisation remains an important source of uncertainty in event-generator predictions for the future Electron-Ion Collider (EIC). While existing hadronisation tunes are largely constrained by LEP data, HERA measurements provide complementary information from electron–proton collisions in a kinematic regime more closely related to that of the EIC.
We present recent...
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Christian Gutschow (UCL (UK))27/08/2026, 16:30
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Arjun Kumar28/08/2026, 09:30
BeAGLE (Benchmark eA Generator for Leptoproduction) is the primary event generator currently used to simulate deep inelastic scattering on nuclei (eA) for the upcoming Electron-Ion Collider (EIC) in the United States. It plays a central role in improving our understanding of key nuclear physics processes, informing detector design, and defining the integration requirements for the interaction...
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Tobias Toll28/08/2026, 10:00
I report on three major new developments in the Sartre event generator.
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1. Sartre calculates coherent and incoherent cross sections in the dipole model for diffractive DIS by taking the first and second moment of the interaction dipole amplitude with respect to initial geometric configurations. As this is an extremely CPU heavy task, we tabulate these moments on file, and these lookup... -
Andrea Signori (University of Turin and INFN), Andrea Signori (University of Pavia and Jefferson Lab)28/08/2026, 10:30
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Giovanni Limatola28/08/2026, 11:30
The large flux of forward neutrinos produced in proton-proton collisions
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at the LHC constitutes a unique opportunity for new studies in neutrino physics,
also including tau neutrino interactions.
The recent SND@LHC and FASER experiments at the LHC will enable
these studies by exploiting this unprecedented flux of high-energy neutrinos.
Deep Inelastic Scattering (DIS) processes provide the... -
Santiago Castro28/08/2026, 12:00
We present theoretical predictions for heavy-quark pair production in deep-inelastic scattering at NLO in QCD, matched to parton-shower evolution within the POWHEG framework. We revisit the NLO amplitude calculation and implement a consistent matching procedure, with careful treatment of heavy-quark mass effects and the avoidance of double counting between fixed-order and parton-shower...
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Alexander Puck Neuwirth (UNIMIB & INFN)28/08/2026, 12:30
Prompt-photon predictions with experimentally relevant isolation criteria retain a residual dependence on parton-to-photon fragmentation functions, whose phenomenological uncertainties remain only weakly constrained.
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We present a pragmatic study of photon fragmentation functions extracted from Pythia parton-shower events and stored in an LHAPDF-compatible format.
We briefly review the role... -
Hamed Abdolmaleki (Malayer university)
Photon Parton Distribution Functions (PDFs) are essential for accurate predictions in high-energy scattering processes involving real photons. Unlike proton PDFs, the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations for photon PDFs are inhomogeneous due to the point-like coupling of the photon to quark-antiquark pairs. While previous extractions exist, they often suffer...
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Constantina Sporleder (University of Jyvaskyla (FI))
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