2013:groups:tools:hepmc
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2013:groups:tools:hepmc [2013/06/06 16:49] jonathan.butterworth created |
2013:groups:tools:hepmc [2013/06/19 10:20] (current) andy.buckley |
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| **Proposed updates for HepMC event record** | **Proposed updates for HepMC event record** | ||
| + | __GenRun__ | ||
| - | There is a need to store the names and version numbers of all generators used in producing an event/ | + | There is a need to store the names and version numbers of all generators used in producing an event. Propose to define a GenRun object to contain cross section (GenCrossSection) and other run-level quantities discussed below. Each GenEvent should link to the GenRun. |
| - | "name" "version" (for generators) | + | __Generator names and versions__ |
| + | Add string array to Genrun with pairs of strings: | ||
| - | vertex applications: | + | "generator name" "generator version" |
| - | jets from UE --> MPI vertices | + | All generators used in the production should be listed, with full version numbers. |
| - | hard vertex --> PDF reweighting | + | |
| - | parton shower --> g->bb splitting probability; ME/PS matching; lepton dressing | + | |
| - | hadronisation --> strip out & redo. BEC. decay chains | + | |
| - | pre-hadronisation W decay --> mass optimisation | + | |
| - | post-hadronisation particle decay --> vertexing etc | + | |
| - | genvertex.ID() | ||
| - | 0 -- undefined (no information) | + | __Vertex ID__ |
| - | 1 -- ME vertex (ie PDF) | + | |
| - | 2 -- secondary partonic scatters | + | |
| - | 3 -- hard decay (prehadronisation) | + | |
| - | 4 -- parton shower (including QED radiation) | + | |
| - | 5 -- primary hadron formation | + | |
| - | 6 -- hadron, tau and muon decays | + | |
| - | 10-99 Generator specific | + | The GenVertex.id() is not currently used/specified. We propose to define six codes: |
| - | NB any shower after a hadronisation is ignored, and the hadrons from it | + | |
| + | * **0 -- undefined** (no information) | ||
| + | * **1 -- Matrix Element vertex** (i.e. the hard process which defines the PDF arguments). (Same as signal vertex) | ||
| + | * **2 -- secondary partonic scatters** (useful for studies of MPI jet production, e.g. for suppressing jets from MPI while retaining the low pT tail of the underlying event, as in [[http://inspirehep.net/record/1216670|this paper]]. | ||
| + | * **3 -- Hard decay** (prehadronisation) e.g. of W, H, Z, t. Useful e.g. for optimisation studies of mass resolution | ||
| + | * **4 -- parton shower** (including QED radiation) Useful for e.g. identifying g->bb splitting probability; ME/PS matching studies; identifying photons for dressing leptons. NB any parton shower after a hadronisation is ignored, and the hadrons from it | ||
| are flagged as being produced in a hadron decay. | are flagged as being produced in a hadron decay. | ||
| + | * **5 -- primary hadron formation** Useful for e.g redoing hadroisation, applying BEC corrections, studying/tracking decay chains. | ||
| + | * **6 -- hadron, tau and muon decays** | ||
| + | |||
| + | We propose that 10-99 be reserved for generator-specific types. | ||
| + | |||
| + | __Weight names__ | ||
| - | --- | + | Some standardisation of weight names is desirable: |
| - | "MUF*** MUR*** 10801 20123" (last number is the PDF ID) | + | "MUF*** MUR*** PDF10801 PDF20123" (last numbers are the LHAPDF/PDFLIB unique PDF member IDs) |
| - | names for each weight. | + | names for each weight, to go in the GenRun, linked to GenWeightContainer? |
2013/groups/tools/hepmc.1370530148.txt.gz · Last modified: 2013/06/06 16:49 by jonathan.butterworth
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