LB RunGroupC Vertex

Vertex Reconstruction studies

Electron Vertex reconstruction

Here are the plots of differences between the simulated x, y, and z vertex positions and the reconstructed vertex positions for a 2cm target. Each histogram corresponds to a difference in the matching coordinate i.e. Simulated Vx - Reconstructed Vx

Histogram for Vx differences

Histogram for Vy differences

Histogram for Vz differences

Now I will show the histograms for the difference between the simulated and the reconstructed vertex positions for the proton

Histogram for Vx differences

Histogram for the Vy differences

Histogram for the Vz differences

Now I will attempt to find the phi shift between the vertex position and the detector. First, I created an ev file called eg12_lb_NoSol.ev with GEMC using the command line gemc -USE_GUI=0 -INPUT_GEN_FILE="LUND, ElasticEvents_FromOrigin.LUND" -N=7000 eg12.gcard

My gcard looks like this

      <detector name="../../../../clas12/fc/forwardCarriage" factory="TEXT" variation="original"/>
      <detector name="../../../../clas12/dc/dc"            factory="TEXT" variation="original"/>      
      <detector name="../../../../clas12/ec/ec"            factory="TEXT" variation="original"/>
      <detector name="../../../../clas12/ctof/ctof"            factory="TEXT" variation="original"/>
      <detector name="../../../../clas12/ftof/ftof"            factory="TEXT" variation="original"/>
      <detector name="../../../../clas12/htcc/htcc"            factory="TEXT" variation="original"/>
       <detector name="../../../clas12/pcal/pcal"            factory="TEXT" variation="original"/>
      <option name="SCALE_FIELD" value="clas12-torus-big, -1"/>
     <option name="OUTPUT" value="evio,eg12.ev"/>

then I ran the reconstruction program using

~/src/CLAS/coatjava/bin/clas12-reconstruction -s FMT:DCHB:DCTB:FTOF:EC:EB -config DCTB::useRaster=true -config MAG::solenoid=0 -i eg12_lb_NoSol.ev -o eg12_lb_NoSol_rec.ev

Once these two evio files have been created, the investigation into the phi shift can begin to be studied by looking at the events in the ced of coatjava. Below I will show a few of the different events for the simulated and the reconstructed particles as seen in the ced.

References

https://clasweb.jlab.org/wiki/index.php/TF_EG12_Vertex#Z_resolution_With_micro-megas

EG12#Vertex_Studies