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0001 # Helix
0002
0003 contact person: marr@bnl.gov
0004
0005 This example utilizes helix swimming method to find two-track DCA
0006 which can be used for reconstructing D0 decay vertices.
0007
0008 Usage:
0009 ```
0010 eic-shell
0011 make
0012 ./analysis
0013 ```
0014
0015 If you want to use the code locally, please make sure you have ROOT
0016 installed. In particular, if your ROOT is compiled with a recent c++ verion, you
0017 might need to replace the following two lines in StHelix.h
0018 ```
0019 if (!::finite(mDipAngle )) return 11;
0020 if (!::finite(mCurvature )) return 12;
0021 ```
0022 with
0023 ```
0024 if (!std::isfinite(mDipAngle )) return 11;
0025 if (!std::isfinite(mCurvature )) return 12;
0026 ```
