Speaker
Description
In this study we investigate the feasibility of detecting heavy neutral leptons ($N_d$) 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 ab$^{-1}$. A range of heavy neutral lepton masses between the Z boson and Higgs boson masses are studied. The $2\sigma$ significance reach for the joint branching ratio of $BR(H\to\nu N_d)BR(N_d\to lW)$ is about 0.1%, nearly independent of the mass, 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 $|\epsilon_{id}|^2$ between SM neutrinos and the heavy neutral lepton, it is expected to have a factor of 10 improvement from current constraints.
| Alternate track | 03. Beyond the Standard Model |
|---|---|
| I read the instructions above | Yes |
