2024/12/11 by Kingman Cheung, Cheung, Kingman, C. J. Ouseph +3
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle Detector Development and Performance #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2412.08212
openalex publication_date 2024/12/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the potential of using the signature of mono-Higgs plus large missing energies to constrain on two new physics models, namely the model of an axion-like particle (ALP) and the model of sterile neutrinos. We focus on the Higgs-ALP interactions starting at dimension-six and the Higgs-sterile neutrino interactions starting at dimension-five, via the processes pp → h a a for ALP production and pp → h N N for sterile neutrinos at the LHC and High Luminosity LHC (HL-LHC), followed by the Higgs decay h → b b. We establish bounds on the ALP-Higgs coupling \fracCaHΛ2 and sterile neutrino-Higgs coupling (λ3)/(M_*), respectively, for ALP and sterile-neutrino mass ranging from 1 to 60 GeV, using the recent ATLAS data on mono-Higgs plus missing energies at the LHC (√(s) = 13 \rm TeV \rm and L = 139 \rm fb-1). The most stringent constraint occurs in the missing transverse energy MET range 200 < MET ≤ 350 GeV. We also estimate the sensitivities that we can achieve at the HL-LHC (√(s) = 14 TeV and L = 3000 fb-1). We obtain improved sensitivities across various missing energy regions. The ALP model exhibits better sensitivities, particularly at lower mass range, compared to the sterile neutrino model, which shows weaker sensitivities across similar mass and energy ranges. Our results underscore the potential of the mono-Higgs signature as a robust probe for physics beyond the Standard Model.