2020/10/31 by Jun Guo, Jinmian Li, Tianjun Li +1 · 1 citation
Physics and Astronomy · #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.103.116025
published as Phys. Rev. D 103, 116025 (2021) · 18 pages, 8 figures, version accepted for publication in PRD
arxiv created 2021/06/09 · arxiv updated 2021/07/07
By representing each collider event as a point cloud, we adopt the Graphic Convolutional Network (GCN) with focal loss to reconstruct the Higgs jet in it. This method provides higher Higgs tagging efficiency and better reconstruction accuracy than the traditional methods which use jet substructure information. The GCN, which is trained on events of the H+jets process, is capable of detecting a Higgs jet in events of several different processes, even though the performance degrades when there are boosted heavy particles other than the Higgs in the event. We also demonstrate the signal and background discrimination capacity of the GCN by applying it to the tt process. Taking the outputs of the network as new features to complement the traditional jet substructure variables, the tt events can be separated further from the H+jets events.