People: A.Kotwal (Fermilab/Duke), L.Gray (Fermilab), S.Chekanov (ANL), J.Strube (PNNL), N.Tran (Fermilab), S-S. Yu (NCU), S.Sen (Duke), J.Repond (ANL)

This wiki describes physics studies for a FCC-hh detector. You can find Monte Carlo samples in the LCIO format using the rfull005 search link. This link prints all event samples after full detector simulations (“tag rfull005”). Select “info” and then find the tag “rfull001” which prints LCIO files for a given MC sample. You can download such samples as discussed in HepSim manual.

The results shown on this page use the Jas4pp data-analysis package. The installation does not have external dependencies besides Java. Make sure Java7 and above is installed. Then run these commands to install the package using Linux/Mac with the “bash” shell:

wget http://atlaswww.hep.anl.gov/asc/jas4pp/download/current.php -O jas4pp.tgz
tar -zvxf jas4pp.tgz
cd jas4pp
source ./setup.sh # takes 5 sec for first-time optimization

The last command optimizes Java packages for the Python language. Now you are ready to run over any file with truth-level and datector-simulation files, such as LCIO and ProMC. This program can be used for:

• Downloading and searching HepSim data
• Processing ProMC files from HepSim
• Running over SLCIO files with Geant4 simulated / reconstructed events.
• Data analysis (jets, physics vectors, histogram packages)
• Visualisation of reconstructed events using Wired4 display

You can find more details in HepSim manual. All examples for this page are located in the “examples/slic/” directory.

The standard set of containers is available from the LCIO files posted on HepSim. Read Manual. The API is described in LCIO Java API description.

Look the Java API definition of the needed objects in org.lcsim.lcio. The data containers are shown below:

BeamCalHits
CalorimeterHitRelations
EM_BARREL
EM_ENDCAP
EcalBarrelHits
EcalEndcapHits
HAD_BARREL
HAD_ENDCAP
HcalBarrelHits
HcalEndcapHits
HelicalTrackHitRelations
HelicalTrackHits
HelicalTrackMCRelations
LumiCalHits
MCParticle
MUON_BARREL
MUON_ENDCAP
MuonBarrelHits
MuonEndcapHits
PandoraPFOCollection
ReconClusters
SiTrackerBarrelHits
SiTrackerEndcapHits
SiTrackerForwardHits
SiVertexBarrelHits
SiVertexEndcapHits
StateAtECal
StateAtEnd
StateAtStart
TKR_RawTrackerHits
TKR_TrackerHits
Tracks
VXD_RawTrackerHits
VXD_TrackerHits

If you need to read LCIO files in C++ code with ROOT/FastJet, use this example package:

wget http://atlaswww.hep.anl.gov/hepsim/soft/lcio-cpp.tgz -O - | tar -xz;
cd lcio-cpp; make 

It will compile “example.cpp” file linking FastJet package. Look at README file to see how to install the “LCIO” package required by this example. Your LCIO“ files from HepSim should be in the directory “data”.

The current version of the FCC-hh detector is located in the detector repository. Find the zip file with your detector, say “detector.zip” file. You can study this geometry using the description link. This geometry corresponds to . Note that only barrel region |eta|<1.7 is currently works, so you would need to set a cut |eta|<1.2 for jets to avoid end-cap regions.

To visualize this detector, use Wired4:

wget http://atlaswww.hep.anl.gov/hepsim/soft/detectors/sifcch4/sifcch4.heprep
jaspp sifcch3.heprep

Generally, when you open SLCIO file, this detector geometry is copied to the cache directory (in $HOME/.lcsim).

You can run Jas+Wired to visualize the simulated events. The Wired program is included in the Jas4pp program, so you simply run it as:

jaspp sifcch4.heprep

The file sifcch4.heprep can be found inside sifcch4.zip file located in the detector repository. Alternatively, visualize the detector as [File]-[Open data source]-[HepRep] XML. You will see the detector layout.

Now, we will read the event: Open any *.slcio file you copied from HepSim as [File]-[Open data source]-[LCIO] file. Then click a small button [Go] (top menu bar). It will process events. Then select again [File]-[New]-[Wired 4 view]. You will get an image in the Wired4 display as this:

Now press [Go] again to look at next event.

If you want to see how data records are organized inside the slcio file, do this [File]-[New]-[LCSim Event browser]

To view “slcio” files, Jas4pp automatically downloads the detector geometry from detector repository, therefore, you do not need manual download of heprep files.

(contribution from N.Nikiforou):

You can also visualize the detector using ROOT. Here are a few steps: Locate the file sifcch4.gdml inside sifcch4.zip. This file is created using

slic -g detector.lcdd -G detector.gdml

Once you have the GDML file, you can use ROOT to visualize it. You just need to make sure the ROOT installation has openGL/GDML support (CERN AFS installations have it for sure). At the ROOT prompt do:

TGeoManager::Import("geometryOutputGDMLFormat.gdml");
gGeoManager->GetTopVolume()->Draw("ogl");

This should popup an OpenGL dispaly with the detector which you can clip, pan, rotate etc.

This collection of tools for future collider studies was developed at ANL (S.Chekanov, [email protected]) in collaboration with Jan Strube (PNNL) ([email protected]) and Ashutosh Kotwal (Duke U) [email protected]. The Java part of the simulator for the linear collider was designed N. Graf, J. McCormick, T.Jonson

~~REFNOTES~~

— Sergei Chekanov 2015/10/08 09:31