TL;DR
This paper discusses how the MATHUSLA experiment can detect light, long-lived particles from hidden sectors, especially through exotic Higgs decays, and suggests design improvements to enhance its sensitivity.
Contribution
It demonstrates MATHUSLA's potential to explore new parameter space for light hidden particles, focusing on a scalar mixed with the Higgs boson.
Findings
MATHUSLA can detect light long-lived particles from rare meson decays.
The experiment can probe unexplored regions of Higgs decay parameter space.
Design modifications can improve detection capabilities for very light hidden particles.
Abstract
A hidden sector containing light long-lived particles provides a well-motivated place to find new physics. The recently proposed MATHUSLA experiment has the potential to be extremely sensitive to light particles originating from rare meson decays in the very long lifetime region. In this work, we illustrate this strength with the specific example of a light scalar mixed with the standard model-like Higgs boson, a model where MATHUSLA can further probe unexplored parameter space from exotic Higgs decays. Design augmentations should be considered in order to maximize the ability of MATHUSLA to discover very light hidden sector particles.
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