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If a significant amount of energy is in multiple, non-contiguous clusters then we will have to find a way to stitch them together. Fortunately this is not the case with electrons or pions when we make no cuts on time or energy.
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For both electrons and pions, an average of about 95% of the energy is contained in the highest energy cluster. |
Shower Shape and Profile
Now that we have our clusters, we can analyze them. Cluster objects in org.lcsim have a number of methods for obtaining information about a cluster. One is the getShape() method, which returns an array of six doubles. As of this writing, the last three values are not implemented and always return zero. The first value appears to be a measurement of the shower's energy profile by depth in millimeters. The second two appear to give orthogonal measurements of the shower width. The algorithm uses an inertial tensor to generate these values (see org.lcsim.recon.cluster.util.TensorPropertyClusterCalculator for the nitty gritty details).
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The first three values of the getShape() parameter for electrons and pions. |
