LB RunGroupC Vertex

Vertex Reconstruction studies

Electron Vertex reconstruction

I have created histograms of the z-vertex resolutions for both the proton and the electron using elastic events from the origin. I used the gemc command line to output a file called eg12_lb_NoSol.ev

gemc -USE_GUI=0 -INPUT_GEN_FILE="LUND, ElasticEvents_FromOrigin.LUND" -N=75000 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_lb_NoSol.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

After that I used the eg12_lb_NoSol_rec.ev to create the histograms

Here are the histograms when the solenoid is off

Then I ran the GEMC simulation with the solenoid on. My gcard was

<gcard>

      <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="HALL_FIELD"  value="clas12-solenoid"/>
     <option name="OUTPUT" value="evio, eg12_lb_Sol.ev"/>

</gcard>

Which gives the output file eg12_lb_Sol.ev. I used the GEMC command line

gemc -USE_GUI=0 -INPUT_GEN_FILE="LUND, ElasticEvents_FromOrigin.LUND" -N=75000 eg12_Sol.gcard

Then I made the reconstructed file, eg12_lb_Sol_rec.ev using the command line

~/src/CLAS/coatjava//bin/clas12-reconstruction -s FMT:DCHB:DCTB:FTOF:EC:EB -config MAG::fields=nominal -i eg12_Sol.ev -o eg12_lb_Sol_rec.ev

The histogram is below

I then investigated the vertex resolution using different radius cuts within the target material

References

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

EG12#Vertex_Studies