LDMX -- The Light Dark Matter eXperiment
Abstract
The Light Dark Matter eXperiment (LDMX) is an electron fixed-target experiment optimized to search for sub-GeV dark matter production through the missing momentum signature. LDMX is designed to operate in End Station A at SLAC, using an 8 GeV electron beam accelerated alongside the LCLS-II drive beam. The design of the apparatus is strongly motivated by the performance requirements of a high-rate missing momentum search and leverages detector technologies and designs from other experiments along with existing facilities at SLAC. LDMX will improve on previous results by up to three orders of magnitude, enabling broad sensitivity to dark sector scenarios including the dark matter interaction strengths motivated by freeze-out of MeV-GeV mass dark matter to the observed relic abundance. With hermetic forward coverage, LDMX also has sensitivity to visible signatures of dark sectors and provides a unique probe of electron-nuclear interactions important to interpreting data from accelerator-based neutrino experiments. This report encompasses the technical design of the LDMX Detector, its simulated performance, and the physics capabilities of the experiment.
Keywords
Cite
@article{arxiv.2508.11833,
title = {LDMX -- The Light Dark Matter eXperiment},
author = {Torsten Akesson and Layan Alsaraya and Stephen Appert and Charles Bell and Elizabeth Berzin and Nikita Blinov and Léo Borrel and Cameron Bravo and Liam Brennan and Lene Kristian Bryngemark and Pierfrancesco Butti and Riccardo Catena and Anthony Chavez and Owen Colegrove and Giulia Collura and Patill Daghlian and Filippo Delzanno and E. Craig Dukes and Valentina Dutta and Bertrand Echenard and Ralf Ehrlich and Thomas Eichlersmith and Jonathan Eisch and Einar Elén and Eric Fernandez and Erich Frahm and Cooper Froemming and Andrew P. Furmanski and Gréta Gajdán and Majd Ghrear and Niramay Gogate and Victor Gomez and Matt Graham and Taylor Gray and Josh Greaves and Chiara Grieco and Craig Group and Peter György and Carsten Hast and Axel Helgstrand and Hannah Herde and Christian Herwig and David G. Hitlin and Tyler Horoho and Cameron Huse and Joseph R. Incandela and David Jang and Nathan Jay and Asahi Jige and Joseph Kaminski and Wesley Ketchum and Matthew Kilpatrick and Kai Kristiansen and Gordan Krnjaic and Susanne Kyre and Travis Lange and Juan Lazaro and Amina Li and Shirley Li and Shujin Li and Yuze Li and Ziqi Lin and Hongyin Liu and Megan Loh and Lisa Andersson Loman and Zihan Ma and Jeremiah Mans and Sanjit Masanam and Phillip Masterson and Steven Metallo and Sophie Middleton and Noah Moran and Omar Moreno and Geoffrey Mullier and Joseph Muse and Akshay Nagar and Timothy Nelson and Gavin Niendorf and Rory O'Dwyer and William Ortez and Lennart Österman and Leo Östman and James Oyang and Pritam Palit and Dhruvanshu Parmar and Jessica Pascadlo and Emrys Peets and Arnaud Pele and Ruth Pöttgen and Huilin Qu and Melissa Quinnan and Jaida Raffelsberger and Benjamin Reese and Chelsea Rodriguez and Eduardo Sanchez and Luis G. Sarmiento and Philip Schuster and Chris Sellgren and Harrison Siegel and Pradyun Solai and Matthew Solt and Francisca Stedman and Cristina Mantilla Suarez and Lauren Tompkins and Natalia Toro and Nhan Tran and Jason Trevor and Tamas Almos Vami and Kieran Wall and Erik Wallin and Zhengyu Wan and Yuxuan Wang and Andrew Whitbeck and Duncan Wilmot and Xinyi Xu and Jihoon Yoo and Danyi Zhang and Guanglei Zhao and Weilong Zhou},
journal= {arXiv preprint arXiv:2508.11833},
year = {2025}
}
Comments
Layan Alsaraya is affiliated with Stanford through San Francisco State University. Riccardo Catena is affiliated with Lund through Chalmers Technical University. Gordan Krnjaic is also affiliated with University of Chicago and the Kavli Institute for Cosmological Physics. Guanglei Zhao is affiliated with Caltech through Reed College. Texas Tech University is no longer a member of the LDMX Collaboration