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0001 # Low-momentum tracking efficiency
0002 The codes in this directory generate single-particle simulations at fixed momenta, with the primary goal being to understand the track-finding efficiency for lower-momentum particles. .
0003
0004 Running events through the ePIC simulation
0005 -------------------------------------------
0006 To create a set of simulations for negative muons at fixed momentum values -- 500 MeV/c, 1 GeV/c, 2 GeV/c, 5 GeV/c, 10 GeV/c, 20 GeV/c -- do the following inside the eic-shell container:
0007
0008 ```
0009 mkdir output
0010 ./run_single_muons_fixed_mom.sh
0011 ```
0012
0013 This will create a set of 6 output simulations, each at a fixed momentum, with 1000 events per simulation. The particles will be generated uniformly in eta and phi.
0014
0015 To run a specfic momentum setting only, you can use the relevant command-line argument. For example, to run only the 500 MeV/c setting, do the following inside the eic-shell container:
0016
0017 ```
0018 ./run_single_muons_fixed_mom.sh 1
0019 ```
0020
0021 To run the same setting as above with an adjusted <i> deltaPhiMax </i> seeding parameter, do the following inside the eic-shell container:
0022
0023 ```
0024 ./run_single_muons_fixed_mom.sh 1 1 0 1000 0.16
0025 ```
0026
0027 Running analysis code to extract efficiency
0028 -------------------------------------------
0029 This analysis code extracts the track efficiency as a function of eta and phi for the above events. Results with truth-seeded tracking are shown in blue; results for real-seeded tracking are shown in green. The results are saved to a single pdf file.
0030
0031 ```
0032 mkdir plots
0033 root -l -b -q track_eff_fixed_mom.C
0034 ```
0035
0036 Comments:
0037
0038 1. For the phi efficiency calculation, only generated particles (events) with |eta| < 3.0 are considered.
0039 2. No track-selection cuts are applied at the analysis level. The ePIC track reconstructed outputs tracks that use at least 3 good measurement hits in the track fit.
0040
0041
