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Main Authors: LDMX Collaboration, Åkesson, Torsten, Berzin, Elizabeth, Bravo, Cameron, Brennan, Liam, Bryngemark, Lene Kristian, Butti, Pierfrancesco, Delzanno, Filippo, Dukes, E. Craig, Dutta, Valentina, Echenard, Bertrand, Ehrlich, Ralf, Eichlersmith, Thomas, Elén, Einar, Furmanski, Andrew, Gomez, Victor, Graham, Matt, Grieco, Chiara, Group, Craig, Herde, Hannah, Herwig, Christian, Hitlin, David G., Horoho, Tyler, Incandela, Joseph, Jay, Nathan, Jige, Asahi, Ketchum, Wesley, Krnjaic, Gordan, Li, Amina, Ma, Zihan, Mans, Jeremiah, Suarez, Cristina Mantilla, Masanam, Sanjit, Masterson, Phillip, Metallo, Steven, Middleton, Sophie, Muse, Joseph, Nelson, Timothy, O'Dwyer, Rory, Oyang, James, Pascadlo, Jessica, Peets, Emrys, Pico, Luis Sarmiento, Pöttgen, Ruth, Schuster, Philip, Sellgren, Chris, Tompkins, Lauren, Toro, Natalia, Tran, Nhan, Vami, Tamas, Wallin, Erik, Wang, Yuxuan, Whitbeck, Andrew, Wilmot, Duncan, Xu, Xinyi, Zhang, Danyi
Format: Preprint
Published: 2025
Subjects:
High Energy Physics - Experiment
Instrumentation and Detectors
Online Access:https://arxiv.org/abs/2508.08121
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Table of Contents:
  • 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 $2\times10^{-13}$ ($5\times10^{-12}$) for a 1MeV (10MeV) dark matter candidate mass.

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