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November 27, 2023 to December 2, 2023
Asia/Shanghai timezone

Searching for dark neutrinos through exotic Higgs decays at the ILC

Dec 1, 2023, 11:45 AM
A214 (Main Building)


Main Building

Parallel or Poster session Future colliders and experiments (including projections) Parallel: Future


Simon Thor (KTH Royal Institute of Technology)


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 at least a factor of 10 improvement from current constraints.

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Primary authors

Junping Tian (The University of Tokyo) Simon Thor (KTH Royal Institute of Technology) Prof. Masaya Ishino (The University of Tokyo)

Presentation materials