Ellis, Stephen D.Hornig, AndrewRoy, Tuhin S.Krohn, DavidSchwartz, Matthew2016-09-292012Ellis, Stephen D., Andrew Hornig, Tuhin S. Roy, David Krohn, and Matthew D. Schwartz. 2012. “Nondeterministic Approach to Tree-Based Jet Substructure.” Physical Review Letters 108 (18) (May). doi:10.1103/physrevlett.108.182003.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:28657433Jet substructure is typically studied using clustering algorithms, such as kT , which arrange the jets’ constituents into trees. Instead of considering a single tree per jet, we propose that multiple trees should be considered, weighted by an appropriate metric. Then each jet in each event produces a distribution for an observable, rather than a single value. Advantages of this approach include: 1) observables have significantly increased statistical stability; and, 2) new observables, such as the variance of the distribution, provide new handles for signal and background discrimination. For example, we find that employing a set of trees substantially reduces the observed fluctuations in the pruned mass distribution, enhancing the likelihood of new particle discovery for a given integrated luminosity. Furthermore, the resulting pruned mass distributions for (background) QCD jets are found to be substantially wider than that for (signal) jets with intrinsic mass scales, e.g. boosted W jets. A cut on this width yields a substantial enhancement in significance relative to a cut on the standard pruned jet mass alone. In particular the luminosity needed for a given significance requirement decreases by a factor of two relative to standard pruning.en-USJournal Article2016-09-2910.1103/PhysRevLett.108.182003