Kavli Affiliate: Mihoko M. Nojiri
| First 5 Authors: Mihoko M. Nojiri, Yasuihito Sakaki, Kohsaku Tobioka, Daiki Ueda,
| Summary:
A beam dump experiment can be seamlessly added to the {proposed}
International Linear Collider (ILC) program because the high energy electron
beam should be dumped after the collision point. The ILC beam dump experiment
will provide an excellent opportunity to search for new long-lived particles.
Since many of them can be produced by a rare decay of standard model particles,
we evaluate spectra of the mesons and $tau$ lepton at the decay based on the
PHITS and PYTHIA8 simulations. As a motivated physics case, we study the
projected sensitivity of heavy neutral leptons at the ILC beam dump experiment.
The heavy neutral leptons can also be produced via deep inelastic scattering
and $Z$ boson decay at the ILC main detector, which we include in the
projection. Assuming zero background for the multi-track signal, the reach
would be greatly extended in mass and coupling, even compared with the other
proposed searches.
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