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T: Fachverband Teilchenphysik
T 10: Axions/ALPS I
T 10.7: Vortrag
Montag, 16. März 2026, 17:45–18:00, KH 01.013
Searching for ALPs in H → 4 K at FCC-ee — Juliette Alimena1, •Sarah Alshamaily2, Sofia Giappichini2, Johannes Hornung2, Markus Klute2, and Matteo Presilla2 — 1Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany — 2Institute for Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
This study investigates a rare Higgs decay at the Future Circular Collider (FCC-ee). The e+e− stage is investigated at a center-of-mass energy of 240 GeV, with an integrated luminosity of 10.8 ab−1. Following the axion-like particle (ALP) effective theory framework of Bauer et al., which provides a model-independent description of light pseudoscalar particles that commonly arise in theories beyond the Standard Model, the processes explored are e+ e− → Z H, where the Higgs boson decays into a pair of ALPs that subsequently decay into pairs of charged kaons. FCC-ee is an excellent experimental environment for such a study due to the improved momentum resolution and clean environment compared to hadronic colliders. We explored the parameter space where ALPs are long-lived particles, where background can be almost fully eliminated by exploiting their displaced decay vertices, obtaining sensitivity contours and limits on the Higgs-ALP coupling.
Keywords: future circular collider; ALP; Higgs rare decays