Les Houches

Slack channel: #np-ps-syst-uncs

Possible projects:

• Shower accuracy and benchmarks
• Amplitude evolution, if people are interested
• Role and impact of the infrared cutoff, tuning, and uncertainties
• A practical approach for experiments
  • What comparisons make sense - what is available?
  • Generators wishlist?
• Including systematic uncertainties in ML based analysis

Interested people: Josh, Simon, Stefan, Vinny, Axel, Aishik, Saptaparna, Andrzej, Ana, Maria V., Gianna, Chris G, Christian P, Max, Peter M

Agreed projects:

1. Perturbative benchmarks of showers [Simon, James, Daniel]
   1. NLL, Numerical impacts
2. Interplay between shower and hadronisation [Simon]
   1. Extending study from LH17 arXiv:1803.07977
   2. Effective/comprehensive uncertainty band
3. Uncertainty recommendation using available tools [Josh]
   1. Setup 4-point variations of all combinations of shower and hadronisation model
   2. Tune these in a consistent way to get an uncertainty envelope
4. Tuning strategies [Stefan K]
   1. What is currently done?
   2. Common framework?
   3. Better documentation of existing framework
   4. Benchmark sets of data

Slack channel: #gen-soft-comp

Possible projects:

• Efficiencies
• MC reweighting/unweighting
• GPU/Vectorisation
• Event format/sharing
• Containerisation/preservation/reproducibility
• Use of ML
• Common frameworks

Interested people: Josh, Vinny, Andrea, Stefan, Saptaparna, Maria V., Sergio, Chris G, Christian P, Ana, Max, Peter M, Simon

Agreed projects:

Slack channel: #ttw

Possible projects:

• Understanding differences between Sherpa MEPS@NLO and aMC+Py8 FxFx?
• Modelling uncertainties?

Interested people: Josh, Sergio, Stefan, Gianna

Slack channel: #ew-evo-id

• Possibly connecting to ttW?

Interested people: Simon, Axel, Andrzej

• Hadronization model should respond to shower IR cut variations
• Study IR ctuoff dependence, map out how purely perturbative variations compare
• goal is to update the LH 17 study on retuning with a more solid theory framework

Interested: Simon, Andrzej, Stefan K.

• Linked to Jets and Higgs

Interested people: Simon, Andrzej

• Linked to Higgs

Interested people: Simon, Josh, Stefan, Axel, Saptaparna

• Linked with Higgs and Jets

Interested people: Josh, Davide?, Stefan

Possible projects:

• New unfolding observables
• Interoperability/practical considerations

Interested people: Vinny,Josh, Aishik, Andrzej, Maria V., Peter M

Slack channel: #lhc-fpf

(Possibly the same for DUNE and EIC if enough people are here?)

Possible projects:

• Impact of NNPDF + FPF data on LHC precision, e.g. W-mass

Interested people: Josh, Maria V., Stefan, Peter M (EIC)