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arXiv · 2508.08121

Sensitivity of an Early Dark Matter Search using the Electromagnetic Calorimeter as a Target for the Light Dark Matter eXperiment

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

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LDMX Collaboration, Torsten Åkesson, Elizabeth Berzin, Cameron Bravo, Liam Brennan, Lene Kristian Bryngemark, Pierfrancesco Butti, Filippo Delzanno, E. Craig Dukes, Valentina Dutta, Bertrand Echenard, Ralf Ehrlich, Thomas Eichlersmith, Einar Elén, Andrew Furmanski, Victor Gomez, Matt Graham, Chiara Grieco, Craig Group, Hannah Herde, Christian Herwig, David G. Hitlin, Tyler Horoho, Joseph Incandela, Nathan Jay, Asahi Jige, Wesley Ketchum, Gordan Krnjaic, Amina Li, Zihan Ma, Jeremiah Mans, Cristina Mantilla Suarez, Sanjit Masanam, Phillip Masterson, Steven Metallo, Sophie Middleton, Joseph Muse, Timothy Nelson, Rory O'Dwyer, James Oyang, Jessica Pascadlo, Emrys Peets, Luis Sarmiento Pico, Ruth Pöttgen, Philip Schuster, Chris Sellgren, Lauren Tompkins, Natalia Toro, Nhan Tran, Tamas Vami, Erik Wallin, Yuxuan Wang, Andrew Whitbeck, Duncan Wilmot, Xinyi Xu, Danyi Zhang. 2025-10-07. Sensitivity of an Early Dark Matter Search using the Electromagnetic Calorimeter as a Target for the Light Dark Matter eXperiment. https://doi.org/10.1007/jhep12(2025)150

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