The Use of Minimal Spanning Trees in Particle Physics
  Minimal spanning trees (MSTs) have been used in cosmology and astronomy to distinguish distributions of points in a multi-dimensional space. They are essentially unknown in particle physics, however. We briefly define MSTs and illustrate their properties through a series of examples. We show how they might be applied to study a typical event sample from a collider experiment and conclude that MSTs may prove useful in distinguishing different classes of events. 
Jessica Lovelace Rainbolt and Michael Schmitt
stat.AP hep-ex physics.data-an