How to make your first STNTUPLE and analyze it

Setup the Mu2e offline environment, buid STNTUPLE libraries, then run:

mu2e -c Stntuple/test/eminus_gun_stnmaker.fcl -n 100

In case of success, the job should produce a STNTUPLE file named nts._USER_eminus_gun_stnmaker.xxx.000001.stn.

nts.user.eminus_gun_stnmaker.xxx.000001.stn is a ROOT file, and it can be opened via TFile::Open or 'new TFile'. One can click on fNTracks and plot the distribution for the number of reconstructed tracks:

How to run the first analysis job

• start ROOT session, load and run stnana

root.exe 

root [0] .L stnana.C 

root [1] stnana("file","nts.user.eminus_gun_stnmaker.xxx.000001.stn","","","val_stn(11,28)/save=eminus_gun_stnmaker.hist",100) 

• start TBrowser

  root [2] new TBrowser 

• in the the browser navigation panel, go to root/Ana/Validation/Hist folder and explore histograms there. The histograms are booked and filled by Stntuple/ana/TValidationModule.cc. Histograms are also saved to a file eminus_gun_stnmaker.hist.
• see FCL files in Stntuple/test for examples of different job configurations.
• see code in Analyses/src for examples of how to use different Mu2e data products