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High Energy


HE Seminar Tuhin Roy

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

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