Novelty detection is a task of machine learning that aims at detecting novel events without a prior knowledge. In particular, its techniques can be applied to detect unexpected signals from new phenomena at colliders. We develop an analysis scheme that exploits the complementarity between isolation-based and clustering-based novelty evaluators. This approach can significantly improve the performance and overall applicability of novelty detection at colliders, which we demonstrate using a variety of two dimensional Gaussian samples mimicking collider events. As a further proof of principle, we subsequently apply this scheme to the detection of two significantly different signals at the LHC featuring a tt¯γγtt¯γγ final state: tt¯htt¯h, giving a narrow resonance in the diphoton mass spectrum, and gravity-mediated supersymmetry, resulting in broad distributions at high transverse momentum. Compared to existing dedicated searches at the LHC, the sensitivities for detecting both signals are found to be encouraging.
Mr. Xuhui JIANG obtained his bachelor degree of physics in Nanjing University in 2017 and now is a final year PhD candidate affiliated to the Hong Kong University of Science and Technology. His research interests include collider phenomenology, machine learning, flavor physics and etc.
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