Kavli Affiliate: Gordan Krnjaic
| First 5 Authors: Torsten Åkesson, Nikita Blinov, Lukas Brand-Baugher, Cameron Bravo, Lene Kristian Bryngemark
| Summary:
The constituents of dark matter are still unknown, and the viable
possibilities span a vast range of masses. The physics community has
established searching for sub-GeV dark matter as a high priority and identified
accelerator-based experiments as an essential facet of this search strategy. A
key goal of the accelerator-based dark matter program is testing the broad idea
of thermally produced sub-GeV dark matter through experiments designed to
directly produce dark matter particles. The most sensitive way to search for
the production of light dark matter is to use a primary electron beam to
produce it in fixed-target collisions. The Light Dark Matter eXperiment (LDMX)
is an electron-beam fixed-target missing-momentum experiment that realizes this
approach and provides unique sensitivity to light dark matter in the sub-GeV
range. This contribution provides an overview of the theoretical motivation,
the main experimental challenges, how LDMX addresses these challenges, and
projected sensitivities. We further describe the capabilities of LDMX to
explore other interesting new and standard physics, such as visibly-decaying
axion and vector mediators or rare meson decays, and to provide timely
electronuclear scattering measurements that will inform the modeling of
neutrino-nucleus scattering for DUNE.
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