Abstract
A method is introduced for distinguishing top jets (boosted, hadronically decaying top quarks) from light-quark and gluon jets using jet substructure. The procedure involves parsing the jet cluster to resolve its subjets and then imposing kinematic constraints. With this method, light-quark or gluon jets with can be rejected with an efficiency of around 99% while retaining up to 40% of top jets. This reduces the dijet background to heavy resonances by a factor of , thereby allowing resonance searches in to be extended into the all-hadronic channel. In addition, top tagging can be used in events when one of the top quarks decays semileptonically, in events with missing energy, and in studies of -tagging efficiency at high .
- Received 9 June 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.142001
©2008 American Physical Society