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dealing with scale uncertainties in PDF fits
benchmark studies for current generation of PDFs, e.g. top distributions
dealing with tensions in LHC data, i.e. ATLAS jets vs CMS jets, top distributions
does each group have the same reaction to the tensions?
how to get the greatest knowledge from distributions with tensions?
electroweak effects in PDF fits
dealing with NNLO grids (NNLOJET)
LH17 showed that PS predictions agree well with each other when input parameters are synchronized; reasonable physics choices then lead to differences; can we establish the limit of what these reasonable physics choices are?
better understanding of limits of precision for ME/ME+PS calculations
uncertainties in matching PS with ME
better understanding of 'reasonable' scale uncertainties at NNLO
precision predictions in the high pT frontier
Progress with higher order calculations:
any benchmarking, for example DY at NNLO?
improvements for evaluation of 2→2 at NNLO
outlook for 2→3 NNLO
3-loop, e.g. Higgs rapidity
compact expressions at the amplitude level
ntuples for NNLO
Jets: Where is quark/gluon discrimination useful? How does it perform? Examples:
Parton shower and underlying event related systematics in Higgs measurements for signal and background (together with Loops,Multilegs,Jets)
Prospect of quark/gluon jet tagging for VBF (synergy with Jets session)
Predictions+uncertainty models for backgrounds to ttH production: tt+HF, ggH+HF, tt+V
Background function choice for H→gamgam and H→mumu: how to evaluate the functional choice systematics
Brainstorming on “STXS for Higgs decays” or something similar for decay propery measurements
Updates on STXS for production
Probing Higgs Width and Top Quark Yukawa Coupling from ttH and tttt
Higgs pair production and self-coupling observables, top quark mass-scheme uncertainties
EFT description of Higgs production
MC and Tools
ttbar: mismodeling of top pt and spin correlations. There are tensions between ATLAS and CMS in top distributions. Other variables to look at? Dedicated study performed by MC authors, comprehensive of main uncertainties.
W-mass and precise EW measurements: where are the bottlenecks? Is the specific ATLAS W-mass tune working well for all observables (y_Z)?
Vector Bosons scattering: follow up from LH17. Continue “benchmarking” study at NLO, to expose differences due to different approximations made in the NLO computation. NLO+PS: check distributions and make sure all EXP are aware of differences among different generators and showers.
EW effects in PS. It's known that they are important for HE. Collect/study examples where these effects are relevant, produce some representative plots. LH proceeding can become a reference, as well as a place where the “TH challenge” is stated.
High performance computing: can we use LH as a platform to initiate some study on performances, negative weights, etc. What are the needs for high-energy pp machines and more in general to future colliders? How should we define a metric?
Legacy data: what’s the best format, how to make sure TH can easily access it, and even just find the important information for their needs (e.g. for PDF fitters and constraints on EFT). Is HEPDATA enough? Can we use it more efficiently?
Z+1 jet: distorsion of Z rapidity / PS mapping for radiation.
Higgs: new physics
Higgs pairs: lambda_HHH from single & double;
VBF Higgs pairs: C2v, Cv relation
Rare decays: benchmark for H→aa→gamgamgamgam
Rare and exotic Higgs decays: further channels not searched for? motivation in specific BSM scenarios?
CP violation and Higgs: (HL-)LHC sensitivity, complementarity with other probes (e.g. EDMs)
Lighter than 125 GeV scalars: how well are they covered by LHC and LEP?
Interpretation of SM coupling/STXS constraints in BSM benchmarks
MSSM: how to close the gap in the high mA (>= 500 GeV), intermediate tan(beta) range?
Precision measurements to sharpen interpretation of Higgs results (W mass, TGCs, W/Z coupling to quarks, CKM …)
New physics at the high-energy tail of Higgs distributions
Precision physics at the LHC
Precision measurements of Z and W couplings to quarks
Lepton flavor violation in W decays
Measurement of CKM elements
High-energy tail of Drell-Yan production
VLQs beyond V/Hq decays
Complex DM and colliders
High pT searches connected with the flavour anomalies
Optimized leptoquark and Z' searches
Tail of the di-leptons distributions
BSM and Machine Learning
Determination of model parameters
2d/3d/4d Image analysis for HEP e.g. jets
New Searches with ML (search algorithms, generic searches, automatisation, density estimation, deep networks / auto-encoders etc.)