2019:groups:higgs:ggzh
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2019:groups:higgs:ggzh [2019/06/12 10:22] stephen.jones |
2019:groups:higgs:ggzh [2019/06/18 16:49] (current) carlo_enrico.pandini |
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| ====== gg -> ZH + 0/1 Jet ====== | ====== gg -> ZH + 0/1 Jet ====== | ||
| - | **Project Descripton** | + | **Project Description** |
| + | |||
| + | Look at MC multileg 0+1jet@LO description of ggZH process, compare nominal prediction vs simple LO MC. | ||
| + | From QCD scale variations derive estimate of uncertainties for STXS VH bins and quantify the improvement from LO MC to 0+1jet@LO multileg MC. | ||
| **Interested Participants** | **Interested Participants** | ||
| + | |||
| + | Carlo Pandini, Emanuele Re, Milene Calvetti, Valerio Dao, Enrico Bothmann, Paolo Francavilla | ||
| + | |||
| + | **Preliminary Sherpa results** | ||
| + | |||
| + | Here is a first proof-of-principle nominal prediction for 0+1jet@LO with Sherpa: | ||
| + | * [[https://www.theorie.physik.uni-goettingen.de/~bothmann/les_houches_2019_zh_gluon_initiated/rivet-plots/|Rivet Plots]] | ||
| + | * [[https://www.theorie.physik.uni-goettingen.de/~bothmann/les_houches_2019_zh_gluon_initiated/setups/zh/zh.dat|Config File]] | ||
| + | |||
| + | **Points to consider** | ||
| + | * check that e.g. powheg+py8 and mg5+py8 give the same, if the shower starting scale is the same | ||
| + | * 2 "substudies": 1 targeted to just the [[https://twiki.cern.ch/twiki/pub/LHCPhysics/LHCHXSWGFiducialAndSTXS/simplifiedXS_VH_1.1.pdf|STXS bins]], one with some more differential distributions | ||
| + | * tools: powheg+py8 (current baseline for ATLAS/CMS), mg5+py8 (0 jet / 0+1 jet LO merging), sherpa (0 jet / 0+1 jet LO merging) | ||
| + | * for this study: H undecayed, Z decaying to 1 lepton family. Check that stxs rivet routine can do this (for py8 as well as sherpa). Otherwise, can also do H->bb, but in this case we need to have the complete information in the HepMC also for sherpa, as Rivet looks for Higgs and Z as the last entry with correct id before the decay.. | ||
| + | * for STXS unc.: consider jet pT spectrum (for definition of nJet bins) and impact on uncertainties | ||
| + | * for mg5+py8 validation: m(VH) is a good variable to check inclusive / 0+1jet multileg agreement | ||
| + | |||
| + | **Rivet code** | ||
| + | * [[https://gitlab.cern.ch/LHCHIGGSXS/LHCHXSWG2/STXS/Classification|STXS-rivet routine]]: keep unchanged to run over STXS bin selection | ||
| + | * VH-HXSWG-rivet routine (will add link here): use this to include additional variables, and any modification we might want to consider | ||
| + | * we can for each MC setup run both routines, to get results for both "substudies" | ||
| + | |||
2019/groups/higgs/ggzh.1560327753.txt.gz · Last modified: 2019/06/12 10:22 by stephen.jones
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