Sensitivity of an early dark matter search using the electromagnetic calorimeter as a target for the Light Dark Matter eXperiment

Summary, in English

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: T. Åkesson; L.K. Bryngemark; E. Elén; H. Herde; L.S. Pico; R. Pöttgen; E. Wallin; D. Zhang
• Department/s: Particle and nuclear physics
• Publishing year: 2025
• Language: English
• Publication/Series: Journal of High Energy Physics
• Volume: 2025
• Issue: 12
• Links: http://dx.doi.org/10.1007/JHEP12(2025)150
• Document type: Journal article
• Publisher: Springer
• Topic: Subatomic Physics
• Keywords: Dark Matter; Fixed Target Experiments
• Status: Published
• ISBN/ISSN/Other: ISSN: 1029-8479