@article{158bbf9c-0095-46b8-8c3a-4d5ca3a3ca98,
  abstract     = {{The Light Dark Matter eXperiment (LDMX) is proposed to employ a thin tungsten target and a multi-GeV electron beam to carry out a missing momentum search for the production of dark matter candidate particles. We study the sensitivity for a complementary missing-energy-based search using the LDMX Electromagnetic Calorimeter as an active target with a focus on early running. In this context, we construct an event selection from a limited set of variables that projects sensitivity into previously-unexplored regions of light dark matter phase space — down to an effective dark photon interaction strength y of approximately 2 × 10−13 (5 × 10−12) for a 1 MeV (10 MeV) dark matter candidate mass. © The Author(s) 2025.}},
  author       = {{Åkesson, T. and Bryngemark, L.K. and Elén, E. and Herde, H. and Pico, L.S. and Pöttgen, R. and Wallin, E. and Zhang, D.}},
  issn         = {{1029-8479}},
  keywords     = {{Dark Matter; Fixed Target Experiments}},
  language     = {{eng}},
  number       = {{12}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{Sensitivity of an early dark matter search using the electromagnetic calorimeter as a target for the Light Dark Matter eXperiment}},
  url          = {{http://dx.doi.org/10.1007/JHEP12(2025)150}},
  doi          = {{10.1007/JHEP12(2025)150}},
  volume       = {{2025}},
  year         = {{2025}},
}