Deep Learning Jet Substructure from Two-Particle Correlation

Kai-Feng Chen^1*, Yang-Ting Chien^2,3

¹Department of Physics, National Taiwan University, Taipei, Taiwan
²C.N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, NY, USA
³Center for Frontiers in Nuclear Science, Stony Brook University, Stony Brook, NY, USA

* Presenter:Kai-Feng Chen, email:kfjack@phys.ntu.edu.tw

Deciphering the complex information contained in jets produced in collider events requires a physical organization of the jet data. We introduce two-particle correlations (2PCs) by pairing individual particles as the initial jet representation from which a probabilistic model can be built. Particle momenta, as well as particle types and vertex information are included in the correlation. A novel, two-particle correlation neural network (2PCNN) architecture is constructed by combining neural network based filters on 2PCs and a deep neural network for capturing jet kinematic information. The 2PCNN is applied to boosted boson and heavy flavor tagging, and it achieves excellent performance by comparing to models based on telescoping deconstruction. Major correlation pairs exploited in the trained models are also identified, which shed light on the physical significance of certain jet substructure.

Keywords: Jet substructure, Deep learning, Two-particle correlation