Jet-Origin Identification and Its Application at an Electron-Positron Higgs Factory

Abstract

To enhance the scientific discovery power of high-energy collider experiments, we propose and realize the concept of jet-origin identification that categorizes jets into five quark species (b,c,s,u,d), five antiquarks (b¯,c¯,s¯,u¯,d¯), and the gluon. Using state-of-the-art algorithms and simulated νν¯H,H→jj events at 240 GeV center-of-mass energy at the electron-positron Higgs factory, the jet-origin identification simultaneously reaches jet flavor tagging efficiencies ranging from 67% to 92% for bottom, charm, and strange quarks and jet charge flip rates of 7%–24% for all quark species. We apply the jet-origin identification to Higgs rare and exotic decay measurements at the nominal luminosity of the Circular Electron Positron Collider and conclude that the upper limits on the branching ratios of H→ss¯,uu¯,dd¯ and H→sb,db,uc,ds can be determined to 2×10−4 to 1×10−3 at 95% confidence level. The derived upper limit for H→ss¯ decay is approximately 3 times the prediction of the standard model. Published by the American Physical Society 2024