This wiki explains how to view electron-proton collision events. The analysis package is described in FpadSoft package

We will use e-p events shown in http://atlaswww.hep.anl.gov/hepsim/index.php?c=emp&e=141&t=all. The full simulations are located under the tag “rfull001”, which corresponds to SiD simulations.

Install FpadSoft package. Then copy the detector geometry file to the local directory where the file “fjas” is:

wget http://atlaswww.hep.anl.gov/asc/hepsim/soft/detectors/sidloi3.tgz -O - | tar -xz;

This creates the directory “sidloi3”. This detector corresponds to “rfull001” tag used for the reconstruction of events in http://atlaswww.hep.anl.gov/hepsim/index.php?c=emp&e=141&t=all.

Now we can visualize the detector as [File]-[Open data source]-[HepRep] XML and select file “sidloi3/sidloi3.heprep”. This is how to do this using the command line:

./fjas sidloi3/sidloi3.heprep

Now you should see the detector layout.

Next, we will read the simulated events: Open any *.slcio file you copied from HepSim using the menu [File]-[Open data source]-[LCIO] For e-p events, use this LCIO file from rfull001.

wget http://mc.hep.anl.gov/asc/hepsim/events/ep/141gev/lepto6ard_dis5q2//rfull001/lepto6ard_dis5q2_0001_pandora.slcio

Then click a small button [Go] (top menu bar). It will process events. Then select again [File]-[New]-[Wired 4 view]. If you want to see how data records are organized inside the slcio file, do this [File]-[New]-[LCSim Event browser]

Here are images of ep collision with a scattered electron identified using the PFA. The images were done using DIS ep samples http://atlaswww.hep.anl.gov/hepsim/info.php?item=159. Reconstructed electron energy from PFA: E=16.92 GeV “EVGEN” energy: 16.90 GeV

Please read FpadSoft

— Sergei Chekanov 2016/01/22 20:36