October 24 (Tue) at 16:30 - 17:30, 2023 (JST)
  • Simon Thor (Ph.D. Student, KTH Royal Institute of Technology, Sweden)
  • via Zoom
Nagisa Hiroshima

In this study we investigate the feasibility of detecting heavy dark neutrinos ($N_d$) through exotic Higgs decays at the proposed International Linear Collider (ILC), specifically in the channel of $e^+ e^- \to qq~ H$ with $H\to \nu N_d \to \nu~lW \to \nu l~qq$. Analyses based on full detector simulations of the ILD are performed at the center-of-mass energy of 250 GeV for two different beam polarization schemes with a total integrated luminosity of 2 $\mathrm{ab}^{-1}$. A range of dark neutrino masses between the $Z$ boson and Higgs boson masses are studied. The $2\sigma$ significance reach for the joint branching ratio of $BR(H\to\nu N_d)\cdot BR(N_d\to lW)$ is about 0.1\%, nearly independent of the dark neutrino masses, while the $5\sigma$ discovery is possible at a branching ratio of $0.3\%$. Interpreting these results in terms of constraints on the mixing parameters $|\varepsilon_{id}|^2$ between SM neutrinos and the dark neutrino, it is expected to have a factor of 10 improvement from current constraints.


  1. Simon Thor, Masaya Ishino, Junping Tian, Searching for dark neutrinos through exotic Higgs decays at the ILC, arXiv: 2309.11254

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