Simplified Template Cross Sections (STXS) and EFT constraints
People interested (add your name): Francesco Riva, Ken Mimasu, Fabio Maltoni, Benjamin Fuks, Kristin Lohwasser, Jorge de Blas, Pasquale Musella, Alexandra Carvalho, Caterina Vernieri, Benjamin Freund, Adam Falkowski
Perform a case study of the constraining power on EFT Wilson coefficients from Higgs data through STXS. Compare the sensitivity of performing a fit to the Wilson coefficients of interest via the STXS with a direct fit from LHC data and quantify any loss of information incurred.
Processes of interest:
- Associated production (VH→bb)
- Vector Boson Fusion (VBF→gamma gamma, tau tau, …)
Workflow
Tasks
- Generate signal and background processes (Ken, Jorge)
- Modify madanalysis to smear jets and output csv file (Benjamin)
- Define selection cuts (Caterina and Kristin)
- Develop RooFit-based stat analysis (Kristin)
- Prepare skeleton for BDT training (Pasquale)
Samples to generate
- Baseline:
- 500k events / process
- 4-5 EFT points (start with 1-2)
- VH(bb): SM Z(ll)H, EFT Z(ll)H, SM Z(ll)bb (100<mbb<150)
- VBF(tau tau): SM VBF, EFT VBF, SM Z(tau tau)
- EFT operators to probe: OHW (SILH), more?
Selection cuts and smearing
ZH->bbar
References https://cds.cern.ch/record/2206813/files/ATLAS-CONF-2016-091.pdf?version=1 https://journals.aps.org/prd/abstract/10.1103/PhysRevD.89.012003
Selections:
- leptons > 25 GeV ,|eta|<2.5
- bjets, |eta| < 2.5, pT>20
- Z mass window –> 75 - 105
- ptV>0 GeV
VBS Htautau
References: https://cds.cern.ch/record/2264522/files/HIG-16-043-pas.pdf
Selections:
- Exactly 2 jets > 30 gev
- mjj>300 GeV
- detajj>2.5
- [1) - Note: would probably leave it out?]
- pT (tau) >30 GeV coming from
- tau_had: >50 / >40
- lep-had: >20 (26e) / > 30 (had)
- lep-lep: 13(e)/24(m) / 24(e) / 15(m)
Smearings
- CMS particle flow Jet resolution → https://arxiv.org/pdf/1706.04965.pdf
- ATLAS resolution on taus: http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/PERF-2013-06