Pythia Week 2024

29 Apr 2024, 09:00 → 3 May 2024, 17:00 Europe/London

Mendelssohn Room

Ilkka Helenius (University of Jyväskylä), Peter Skands (Monash University (AU))

Practical Information:

Airports: 

• The most convenient airports are Heathrow (frequent direct bus service to Oxford, 1.5 hours; stops at T5 and at T2/3; look for "The Airline") and Birmingham (direct train service to Oxford, 1h).

• Luton airport is also relatively convenient, with slightly less frequent bus services (look for "National Express").

• Gatwick and Stansted are both quite far from Oxford, and take more than 2 hours to get to. Gatwick is accessible via the same bus line as Heathrow (but takes an hour more to get to). Stansted can be reached by "National Express".

Convenient Apps for Local Transport

• The Oxford Bus Company App
• CityMapper
• 001 Taxis (Uber does not operate in Oxford)
• Trainline (for train tickets to/from Oxford)
• TfL Go if you plan to travel to London.

Zoom Link:

• https://zoom.us/j/95137229848

Monday 29 April

09:10 → 09:25 Welcome and Aims

Including discussion of main goals for the week.

Speaker: Peter Skands (Monash University (AU))

PythiaWeek2024.pdf

09:25 → 09:50 Beam Remnants & Cosmic Rays - Status and Questions

Speaker: Torbjorn Sjostrand (Lund University (SE))

crPythia.pdf

09:50 → 10:15 String Junctions (& Closepacking) - Status and Questions

Speaker: Javira Altmann

pythia24_junctions.pdf

10:15 → 10:45 General Discussion of Physics and Issues related to Hadronization

10:45 → 11:05 Tea

11:05 → 11:30 Angantyr

Speaker: Dr Ilkka Helenius (University of Jyväskylä)

AngantyrUpdate-IH2024.pdf

11:30 → 11:55 EIC and Gleipnir - Status and Plans

Speaker: Leif Lönnblad (Lund University (SE))

11:55 → 12:20 Nuclear Geometries

Speakers: Christian Bierlich, Christian Bierlich (Lund University (SE))

pythia-week2024.key

12:20 → 12:45 General Discussion of Physics and Issues related to Heavy Ions

12:45 → 14:00 Lunch in Town

14:00 → 15:30 GPU Tutorial

Speakers: Leif Lönnblad (Lund University (SE)), Michal Kreps (University of Warwick (GB)), Philip Ilten (University of Cincinnati (US))

cudaBasics.pdf

Pythia240429.pdf

Pythia tutorial

15:30 → 15:45 Tea

15:45 → 16:15 Pythia 8.312

Speaker: Philip Ilten (University of Cincinnati (US))

16:15 → 16:45 Discussion of Future Roles & Funding Opportunities

17:30 → 20:30 Pizza Reception

at 398 Woodstock Road, OX2 8JW. We will leave the department shortly before 5.

Tuesday 30 April

09:10 → 09:25 Total and Diffractive Cross Sections

Speaker: Torbjorn Sjostrand (Lund University (SE))

totalSigmas.pdf

09:30 → 10:10 Careful discussion of Hadronization variations & general variations, related to #210.

10:15 → 10:40 Rivet 4 & Yoda 2

Speaker: Christian Gutschow (UCL (UK))

cg_pythia_dev.pdf

10:45 → 11:05 Tea

11:05 → 11:45 Errors on Errors

Speakers: Enzo Canonero (University of London (GB)), Glen Cowan (Royal Holloway, University of London)

Uncertain_systematics.pdf

12:00 → 12:30 Preliminary Studies

Speaker: Dr Adil Jueid (Institute for Basic Science)

main.pdf

12:45 → 14:00 Lunch in Town

14:00 → 14:20 Self-Introductions: B. Tuncay & L. Bernardinis (Ongoing Tuning Efforts)

Speakers: Lorenzo Bernardinis (Universita e INFN Trieste (IT)), Baris Tuncay (University of Oxford (GB))

Strangeness_tuning_v2.pdf

14:20 → 14:40 MCPLOTS - Update and Plans

Speakers: Natalia Korneeva (Monash University (AU)), Anton Karneyeu (Russian Academy of Sciences (RU))

mcplots.pdf

14:45 → 15:30 Work and Discussions related to Tuning

• Errors on Errors
• Tunes as Command Files
• PDF Updates
• Needs of different communities: From Forward Physics, to B Decays, to FCC-ee, to Hard and Soft Processes at the LHC, to Heavy Ions, EIC, and Cosmic Rays?
• Studying and Reducing Correlations among parameters? Refactorizations, Reparametrizations?
• Tuning and Matching/Merging applications.
• Status of Autotunes now that both Bellm and Gellersen have left?
• Tuning and PDFs (and orders of PDFs)
• ...

Speakers: Peter Skands (Monash University (AU)), Philip Ilten (University of Cincinnati (US))

2024-04 Pythia workshop.pdf

Tuning 2024.pdf

15:30 → 15:45 Tea

15:45 → 16:05 Plans for New Pythia Tuning

Speakers: Peter Skands (Monash University (AU)), Stephen Mrenna

16:10 → 17:00 Getting to a stage where we can use Reweighting and Professor together

Wednesday 1 May

09:10 → 09:40 New C++ Version

Speaker: Philip Ilten (University of Cincinnati (US))

C++ standards

09:45 → 10:45 User Interface to Fragmentation: Discussions and Work

10:45 → 11:05 Tea

11:05 → 12:45 Discussions and Work

• Expect continuations from Monday/Tuesday discussions.

12:45 → 14:00 Lunch in Town

14:00 → 16:00 Discussions and Work

• Fast Glauber from Angantyr to Cosmic-Ray modelling.
• Matching/Merging related issues
• LHE related issues.
• Clang format.
• CERN gitlab vs gitlab.com

16:00 → 17:30 Excursion to Oxford Castle & Prison

Thursday 2 May

09:10 → 09:50 PanScales: Intro & Experience with Pythia Interfacing

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

PythiaWeek-april2024.pdf

A place to look at for better handling of dot products (gets you O(epsilon)) 
https://gitlab.com/panscales/panscales-0.X/-/blob/main/shower-code/MomentumM2.cc?ref_type=heads#L32

09:55 → 10:35 Pythia Contrib (& Tutorial?)

Speaker: Philip Ilten (University of Cincinnati (US))

(1) PYTHIA plugin system

(2) PYTHIA-CONTRIB develop

(3) PYTHIA-CONTRIB install

10:45 → 11:05 Tea

11:05 → 11:30 Self-Introductions: Ludo Scyboz, Basem El-Menoufi, and Jack Helliwell

11:30 → 12:00 PanScales-Pythia Interface: Discussions

12:00 → 12:40 Discussions and Work

• Numerical accuracy (aiming for Cosmic-Ray energy stability and log tests).Tricks from PanScales: Replacing dot products by cross products, ...

12:45 → 14:00 Lunch in Town

14:00 → 14:45 MiNNLOPS (& Pythia)

Speaker: Silvia Zanoli (University of Oxford)

PythiaWeek_Zanoli.pdf

14:45 → 15:30 Discussions and Work

15:30 → 16:00 Tea

16:00 → 17:00 Particle Theory Seminar by Ilkka Helenius

https://zoom.us/j/98685957349?pwd=Z0ZJUE9Odi9MYmlDSDIvYy8zMDVQQT09

Speakers: Dr Ilkka Helenius (University of Jyväskylä), Ilkka Helenius (Helsinki Institute of Physics (HIP)-Univ. of Helsinki, Fac. of S)

Friday 3 May

09:10 → 09:35 Future

Collaboration Roles
Gitlab.com vs CERN Gitlab?

Speaker: Peter Skands (Monash University (AU))

09:35 → 10:15 CR Optimisations & Static Code Analysis

Speakers: Michal Kreps (University of Warwick (GB)), Philip Ilten (University of Cincinnati (US))

colourReconnection.pdf

10:15 → 10:45 Discussion on Optimisation and related issues

• Further CR Optimisations (and related)?
• Identifying MPI bottlenecks. E.g., first-interaction pT and b sampling.
• Systematic Approach to Identifying and Addressing Optimisation Issues?
• Inclusion of various compute-intensive intializations as command files?
• Other Issues related to SCA and Optimisations
• Instruments for Mac (alternative to valgrind)
• Studying and Reducing Correlations among parameters? Refactorizations, Reparametrizations?
• Status and follow-ups on tuning

pythiaTuningProjects.pdf

10:45 → 11:05 Tea

11:05 → 11:30 EvtGen & Pythia

Speaker: Michal Kreps (University of Warwick (GB))

evtgen_pythia_May2024.pdf

11:30 → 11:55 QED in Hadron Decays

Speaker: Peter Skands (Monash University (AU))

12:00 → 12:45 Discussion & Work

Including other aspects related to QED / EW physics?
Including other aspects related to hadron-decay physics?

12:45 → 14:00 Lunch in Town

14:00 → 17:00 Issue Desk and Informal Follow-Ups

Gitlab.com vs CERN Gitlab?