Unsupervised hadronic SUEP at the LHC

Journal of High Energy Physics

Jared Barron¹  Aris Spourdalakis¹  David Curtin¹  Gregor Kasieczka²  Tilman Plehn³ 

[1] Department of Physics, University of Toronto, 60 St. George St., Toronto, Canada;Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, D-22761, Hamburg, Germany;Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg, 16, Heidelberg, Germany;

关键词: Beyond Standard Model;    Hadron-Hadron scattering (experiments);    Jets;    Rare decay;   

DOI  :  10.1007/JHEP12(2021)129

来源: Springer

【 摘 要 】

Confining dark sectors with pseudo-conformal dynamics produce SUEPs, or Soft Unclustered Energy Patterns, at colliders: isotropic dark hadrons with soft and democratic energies. We target the experimental nightmare scenario, SUEPs in exotic Higgs decays, where all dark hadrons decay promptly to SM hadrons. First, we identify three promising observables: the charged particle multiplicity, the event ring isotropy, and the matrix of geometric distances between charged tracks. Their patterns can be exploited through a cut-and-count search, supervised machine learning, or an unsupervised autoencoder. We find that the HL-LHC will probe exotic Higgs branching ratios at the per-cent level, even without a detailed knowledge of the signal features. Our techniques can be applied to other SUEP searches, especially the unsupervised strategy, which is independent of overly specific model assumptions and the corresponding precision simulations.

【 授权许可】

CC BY