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The post-Higgs discovery era has been characterized by an exciting physics programme targeting the investigation of the Higgs boson properties and couplings. Amongst the crucial yet-to-be answered questions in Particle Physics are the shape of the Higgs potential and the nature of the Higgs Yukawa couplings. Probing the Higgs self-coupling, which determines the shape of the Higgs potential and is directly connected to the electroweak symmetry breaking mechanism, is one of the most important goals of the High-Luminosity phase of the Large Hadron Collider (LHC) experiments. Higgs decay modes to light quarks, instead, are key to investigate the universality of the Yukawa couplings but they are very challenging or nearly impossible to detect with the current experiments at the LHC. A future e+e- collider is thus the perfect avenue to pursue this research. The first part of this talk will describe the current results and the future projections of direct tests of the Higgs self-coupling via Higgs pair production with the ATLAS experiment at the LHC. The second part will be dedicated to the development of novel algorithms at future e+e- colliders for tagging jets originating from the hadronisation of strange quarks (strange-tagging) and the first application of such a strange-tagger to a direct Higgs to strange (ℎ → ssbar) analysis with the ILD Concept Group at the International Liner Collider. The study includes a preliminary investigation of a Ring Imaging Cerenkov system (RICH) capable of maximising strange-tagging performance in future Higgs factory detectors.
Bio:
Dr. Cairo is an Experimental Particle Physicist currently working as Research Staff Scientist at CERN. Before CERN, she worked as a post-doctoral researcher for the SLAC National Accelerator Laboratory and the State University of New York at Albany. She obtained her PhD in 2017 from the University of Calabria in Italy. Dr. Cairo is a member of the ATLAS Collaboration at the Large Hadron Collider, where she is pursuing her research programme spanning from Quantum Chromodynamics to Higgs Physics. She is a leader in the field of Higgs pair production analyses for the direct investigation of the Higgs self-coupling. In this context, she is co-coordinating the ATLAS HH → bbar gammagamma team in ATLAS. Beyond LHC, her research includes Higgs Physics and detector technologies at future electron-positron machines, where she is driving the development of strange-jet tagging techniques and detector design to probe light Yukawa couplings. Dr. Cairo is also an expert in the reconstruction of charged-particle trajectories and interaction vertices. Since 2020, she covers the role of co-convener of the ATLAS Tracking group and is currently investigating the potential of 4-dimentional tracking for future detector upgrades. At SLAC, Dr. Cairo was involved in the construction activities of the new silicon-only ATLAS Inner Tracker for the High-Luminosity phase of the LHC.