LHC Monte Carlo WG plenary meeting

5 Oct 2026, 00:00 → 6 Oct 2026, 19:00 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

This is the second plenary and in-person meeting of the LHC MC Working Group. It will cover an overview of the ongoing progress by the experiments and the theoretical community, and report on the ongoing initiatives stimulated by the WG. More details on the format, contents and agenda to follow in due time.

The meeting will take place at CERN and also via Zoom (hybrid format).

To subscribe to the general WG mailing list, used to distribute announcements about WG meetings and available documents, go to 
https://e-groups.cern.ch/e-groups/EgroupsSubscription.do?egroupName=lhc-mcwg

Of potential interest to participants is the MCnet meeting on Wednesday the 7th with presentations of the work done by the students in the LPCC short-term studentship program. Agenda to be posted in due time : https://indico.cern.ch/event/1721951/

Monday 5 October

09:00 Arrival

10:00 Coffee break

1 Welcome

Updates from event generators and related tools

Convener: Leif Lönnblad (Lund University (SE))

2 Sherpa

Speakers: Enrico Bothmann (CERN), TBA

3 Herwig

Speaker: James Whitehead

4 MadGraph

Speaker: Daniele Massaro (CERN)

5 CEDAR tools

Speaker: Tomasz Procter (Jagiellonian University (PL))

6 Pythia

Speaker: Christian Bierlich (Lund University (SE))

12:30 Lunch break

Updates from Experiments

7 ATLAS

Speaker: Spyros Argyropoulos (Aristotle University of Thessaloniki (GR))

8 ALICE

Speaker: Marco Giacalone (CERN)

9 CMS

Speaker: Efe Yazgan (National Taiwan University (TW))

10 LHCb

Speaker: TBA

15:30 Coffee break

Topical session on gluon splitting into (heavy) quarks

Convener: Joey Huston (Michigan State University (US))

11 Introduction

Speaker: Joey Huston (Michigan State University (US))

12 Review from CMS (remote)

Speaker: Jennifer Roloff (Brown University (US))

13 Review from ATLAS

Speaker: Alberto Rescia (Università della Calabria & INFN (IT))

14 Review from Theory/Generators (remote)

Speaker: Christian Preuss (RWTH Aachen University)

15 Discussion

Speaker: Joey Huston (Michigan State University (US))

18:00 Reception

Tuesday 6 October

Repots from sub groups

Convener: Leif Lönnblad (Lund University (SE))

16 HepMC

Speaker: Andrzej Konrad Siodmok (Jagiellonian University (PL))

17 Event sharing

Speaker: Enrico Bothmann (CERN)

18 Tuning

Speakers: Aidin Masouminia (IPPP, Durham University), Lorenzo Bernardinis (Universita e INFN Trieste (IT))

10:30 Coffee break

Monte Carlo uncertainties

Convener: Melissa Corona van Beekveld (Nikhef National institute for subatomic physics (NL))

19 Intoduction

Speaker: Melissa Corona van Beekveld (Nikhef National institute for subatomic physics (NL))

20 Input from the top WG

Speaker: Carlos Vico Villalba (Rice University (US))

21 Input from the Higgs WG

Speaker: Robin Hayes (Nikhef National institute for subatomic physics (NL))

22 Discussion

Speaker: Melissa Corona van Beekveld (Nikhef National institute for subatomic physics (NL))

12:30 Lunch break

Code and hardware acceleration

Convener: Enrico Bothmann (CERN)

23 TBA (MadSpace, MadMatrix, MadNIS, etc.)

Speaker: Theo Heimel (UCLouvain)

24 SHERPA with PEPPER and ML Acceleration

Speaker: Enrico Bothmann (CERN)

25 Floating-Point Accuracy

Speaker: Frantisek Stloukal (Centre National de la Recherche Scientifique (FR))

26 Update on negative-weight reduction methods

Speaker: Jeppe Andersen (IPPP, University of Durham)

27 Reduction of negative and pathological weights

Speaker: Rishabh Jain (Brown University (US))

28 MadVfold: accelerating NLO event generation and reducing negative weights with SIMD vectorization and GPUs

Speaker: Andrea Valassi (CERN)

arxiv preprint

15:48 Coffee break

Discussions, short contributions, and wrap-up