LB RunGroupC Vertex

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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

EVxDiffCuts fnl.jpg

Histogram for Vy differences

EVyDiffCuts fnl.jpg

Histogram for Vz differences

EVzDiffCuts.jpg

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

Histogram for Vx differences

PVxDiffCuts fnl.jpg

Histogram for the Vy differences

PVyDiffCuts fnl.jpg

Histogram for the Vz differences

PVzDiffCuts.jpg

Now I will attempt to find the phi shift between the vertex position and the detector. I created an ev file called eg12_lb.ev with GEMC using the command line gemc -USE_GUI=0 -INPUT_GEN_FILE="LUND, ElasticEvents_FromOrigin.LUND" -N=7000 eg12.gcard

Then I ran the reconstruction using the command line ~/src/CLAS/coatjava//bin/clas12-reconstruction -s FMT:DCHB:DCTB:FTOF:EC:EB -config MAG::fields=nominal -i eg12_lb.ev -o eg12_lb_rec.ev

References

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

EG12#Vertex_Studies