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| Description | HE Seminar Speaker: Tuhin Roy Title: Qjets: A Non-deterministic Approach to Tree-based Jet Substructure Host: Markus Luty Room: 416 Abstract: Jet 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, we introduce a new quantity `volatility', a cut on which reduces the luminosity needed for a given significance requirement by a factor of two. |
| Date | Tue, October 23, 2012 |
| Time | 9:00am-10:00am PDT |
| Duration | 1 hour |
| Access | Public |
| Created by | High-Energy Seminars |
| Updated | Tue, October 2, 2012 11:14am PDT |
| Send Reminder | Yes - 1 day 8 hour 0 minutes before start |
