[clas12_rgk] lides for CLAS collaboration

[Izzy Illari]

Hello all,

I intend to give an update at CLAS collaboration about fiducial cuts 
discussed in meetings: 
https://clasweb.jlab.org/wiki/images/b/b1/FiducialAnalysis_ILLARI.pdf

I have spoken to Nathan and Raffaella & told the following:

1.) The chi2 from REC::Track is not well understood and it might not be 
very effective to cut on it for cleaning event samples

2.) There is a plan to fix this for pass2

3.) It would be more effective to use chi2pid for pass1 data, which is a 
signed Nsigma statistic that quantifies the difference between expected 
and calculated values. For electron/positrons it is based on sampling 
fraction in calorimeter, and for charged hadrons it is based on vertex 
time difference 
https://clasweb.jlab.org/wiki/index.php/CLAS12_DSTs#REC::Particle

I imagine chi2pid could be fit with a gaussian and 5sigma and 3.5sigma 
cuts could be looked at to see how much they clean up event samples. I 
hope the chi2pid can be of some help to others in the group.

Proton DC cuts have not been included due to issues with code.

I would appreciate any additional comments.

Thank you and all the best,

Izzy

-- 
pronouns: they/their/them

Physics Ph.D candidate (Feb 2020)
Columbian College of Arts & Sciences, The George Washington University
M.S. in Physics
The George Washington University (Jan 2020)
B.A. in Physics
Barnard College, Columbia University (May 2017)

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