Les Houches

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===== Preliminary list of topics for 2021 ======
//(accessible to everyone, editing rights to conveners and organizers)//

==== Session 1 ====


**__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 higher 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


**__SM Higgs Topics:__**

    * ggF
      * N3LO PDFs, small-x
      * EW corrections
      * cuts/differential distributions
    * B-quark issues
      * Ttbb, V+HF, VH
      * 4FNS vs 5FNS: bbH, t/H/Z+j QCD EW…
      * Flavour jet algo\
    * ggVV
      * Massive results [if we’ll have them, probably yes]
    * VBF
      * Factor vs non-factor: TH vs EXP discussion on cuts etc (especially Run3)
    * Jet-ology
      * NNLO+NLO res, VH+J, NNLO+decay & fiducial studies
    * HH
      * EFTs, H vs HH
    * In general, EFT fits etc
    * Exp vs theory efficient information exchange
      * Likelihood, discriminators as black box
      * Differential distribution. TH insight for measurements… 
    * PS issues (SLC, higher logs…, liaise with QCD)
    * New opportunity for Run3 (unexplored regions, != cuts etc)
    * STXS
      * for decays - binned proposal 
    * FO/Boosted
      * NLO-Improved NNLO HTL predictions for gg → H(→yy)+Jet in the fiducial region, experimental sensitivity to different decay channels as a function of pt
      * Mixed QCD-EW contributions to higgs (e.g. 2010.09451, 2007.09813)
    *  Backgrounds
      * Predictions+uncertainty models for backgrounds to ttH production: tt+HF, ggH+HF, tt+V, previous proposal was to estimate ttV EW correction in different phase space regions
    * 4FS/5FS
      * bbar -> higgs (e.g. 2004.04752)
      * tHj tZj QCD+EW (e.g. 2006.10086), various 4FS/5FS matching issues to consider
    * Showers
      * New showers, subleading-colour issues with parton showers and possible effects on Higgs physics (PanSccales 2011.10054; Forshaw, Plätzer et al 2003.06400, 2007.09648, 2011.15087, 2012.15215)



==== Session 2 ====
Les Houches

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