Les Houches

(accessible to everyone, editing rights to conveners and organizers)

Jet substructure techniques:

• Interplay of jet substructure with other groups (e.g. jet substructure for EW measurements like VBF, semileptonic VV, etc.)
• Snowmass jet substructure report (JSS at future colliders) [work + discussion]
• What can we do with previous colliders, in light of the LHC [discussion]
• Comparing new unfolding methods
  • Accord on unbinned results (?)
• Probing the latest MC generators (PB algorithm, PANScales, Deductor…) with jet substructure
  • Finite N_C, beyond LL, …

Techniques and calculations for SM phenomenology:

` * Calculations:

• expected precision for fundamental Standard Model processes at 14 and 100 TeV; what calculations are needed to match this precision?
• 2→3 at NNLO; status/challenges/prospects
• theory uncertainties; more rigorous estimates? correlations?
• theoretically sound definition of FONLL at the differential level, beyond incl. cross sections?

• PDFs:
  • followup on PDF4LHC15 benchmarking exercise; better understanding of tolerances, tensions
  • EW corrections/EW PDFs; how to provide consistent calculations
  • small x resummation; what is HERA trying to tell us?
  • EIC; what will EIC tell us? how do we prepare for that?

• Higgs:
  • understanding the SM for high Higgs pT; role of top mass corrections/scheme (MSbar vs on-shell); improving channel sensitivities
  • polarisation measurements (for diboson/VBS as well)

• Top:
  • MSbar vs on-shell
  • ttW; tension; can new calculations resolve it?

• Jets:
  • flavor tagging of jets; matching what theorists can predict (IR safety) and what experimentalists can measure

Monte Carlo:

• Non-perturbative uncertainties
  • common hadronisation interface and variations
  • theoretical understanding
  • differences in tuned comparisons
  • pheno impact for certain classes of processes (e.g. VBF/VBS)
• Shower accuracy studies
  • comparing different schemes on hogher orders, evaluate phenomenological impact
  • Subleading colour and interplay with colour reconnection
  • New sampling methods and algorithms versus machine learning techniques
  • Accuracy of merging resummed calculation versus ME+PS paradigms
• Photon physics, modelling of fragmentation
• Heavy flavour matching
  • review of existing measurements
  • Connecting precision calculation, fragmentation and decays
  • partons at 100 TeV
• Common LHC event bazaar
• Status and needs for electroweak corrections and radiation in shower algorithms
• Machine learning and adaptive Monte Carlo methods