Requires $ROOTSYS is set, and cmake in the $PATH
Then:
mkdir build
cd build
cmake ..
make install
Producing libTagProbability.so. The folder EfficiencyFiles contains the efficiencies in root 2d efficiency histograms
To use it Create an object (once per analysis, not once per event...
TagProbability myTP("Path/To/EfficienyFiles/OBC%i_TwoFourCut_Full_50k_4_40BX.root"); //The %i is important
Then you can call
double GetProbability(const TLorentzVector& electron) const;
double GetProbability(double gevEnergy, double mradTheta, double degreesPhi) const;
bool IsTagged(const TLorentzVector& electron) const;
to query for the efficiency, or isTagged which will say true/false based on random number generator