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Expected Sensitivity of the Light Dark Matter eXperiment to Long-Lived Dark Photons and Axion-Like Particles

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Main Authors:	Akesson, Torsten, Barton, Clay, Bell, Charles, Berzin, Elizabeth, Brennan, Liam, Bryngemark, Lene Kristian, Curtis, Lincoln, Daghlian, Patill, Dukes, E. Craig, Dutta, Valentina, Echenard, Bertrand, Ehrlich, Ralf, Eichlersmith, Thomas, Elén, Einar, Furmanski, Andrew, Ghrear, Majd, Gignac, Matthew, Graham, Matt, Grieco, Chiara, Group, Craig, Herde, Hannah, Herwig, Christian, Hitlin, David G., Horoho, Tyler, Incandela, Joseph, Jay, Nathan, Ketchum, Wesley, Krnjaic, Gordan, Lewis, Oscar, Li, Yuze, Mans, Jeremiah, Suarez, Cristina Mantilla, Masanam, Sanjit, Metallo, Steven, Middleton, Sophie, Nelson, Timothy, O'Dwyer, Rory, Oyang, James, Palit, Pritam, Pascadlo, Jessica, Peets, Emrys, Pico, Luis Sarmiento, Pöttgen, Ruth, Rodriguez, Chelsea, Satterthwaite, Lincoln, Schuster, Philip, Solt, Matt, Tompkins, Lauren, Toro, Natalia, Tran, Nhan, Vami, Tamas, Wall, Kieran, Wallin, Erik, Whitbeck, Andrew, Yoo, Jihoon, Zhang, Danyi
Format:	Preprint
Published:	2026
Subjects:	High Energy Physics - Experiment
Online Access:	Acceder al recurso
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_version_	1866913177450577920
author	Akesson, Torsten Barton, Clay Bell, Charles Berzin, Elizabeth Brennan, Liam Bryngemark, Lene Kristian Curtis, Lincoln Daghlian, Patill Dukes, E. Craig Dutta, Valentina Echenard, Bertrand Ehrlich, Ralf Eichlersmith, Thomas Elén, Einar Furmanski, Andrew Ghrear, Majd Gignac, Matthew Graham, Matt Grieco, Chiara Group, Craig Herde, Hannah Herwig, Christian Hitlin, David G. Horoho, Tyler Incandela, Joseph Jay, Nathan Ketchum, Wesley Krnjaic, Gordan Lewis, Oscar Li, Yuze Mans, Jeremiah Suarez, Cristina Mantilla Masanam, Sanjit Metallo, Steven Middleton, Sophie Nelson, Timothy O'Dwyer, Rory Oyang, James Palit, Pritam Pascadlo, Jessica Peets, Emrys Pico, Luis Sarmiento Pöttgen, Ruth Rodriguez, Chelsea Satterthwaite, Lincoln Schuster, Philip Solt, Matt Tompkins, Lauren Toro, Natalia Tran, Nhan Vami, Tamas Wall, Kieran Wallin, Erik Whitbeck, Andrew Yoo, Jihoon Zhang, Danyi
author_facet	Akesson, Torsten Barton, Clay Bell, Charles Berzin, Elizabeth Brennan, Liam Bryngemark, Lene Kristian Curtis, Lincoln Daghlian, Patill Dukes, E. Craig Dutta, Valentina Echenard, Bertrand Ehrlich, Ralf Eichlersmith, Thomas Elén, Einar Furmanski, Andrew Ghrear, Majd Gignac, Matthew Graham, Matt Grieco, Chiara Group, Craig Herde, Hannah Herwig, Christian Hitlin, David G. Horoho, Tyler Incandela, Joseph Jay, Nathan Ketchum, Wesley Krnjaic, Gordan Lewis, Oscar Li, Yuze Mans, Jeremiah Suarez, Cristina Mantilla Masanam, Sanjit Metallo, Steven Middleton, Sophie Nelson, Timothy O'Dwyer, Rory Oyang, James Palit, Pritam Pascadlo, Jessica Peets, Emrys Pico, Luis Sarmiento Pöttgen, Ruth Rodriguez, Chelsea Satterthwaite, Lincoln Schuster, Philip Solt, Matt Tompkins, Lauren Toro, Natalia Tran, Nhan Vami, Tamas Wall, Kieran Wallin, Erik Whitbeck, Andrew Yoo, Jihoon Zhang, Danyi
contents	The Light Dark Matter eXperiment (LDMX) is an electron-beam fixed-target experiment primarily designed to achieve world-leading, model-independent sensitivity to sub-GeV dark matter particles. LDMX aims to identify dark sector particle production through the detection of events with substantial missing energy and momentum, a signature of invisible particles escaping detection. Beyond this primary objective, LDMX offers a complementary search strategy for long-lived, visibly decaying particles, such as dark photons and axion-like particles. We present the first detailed evaluation of the ability of LDMX to identify visibly decaying, long-lived particles that couple to electrons using a detailed simulation, based on the Geant4-toolkit, that incorporates realistic detection efficiencies and background levels. We demonstrate that LDMX can achieve a sensitivity that is competitive with other experiments that are currently running. The models explored in this paper are distinct and complementary to those probed in the LDMX flagship missing-momentum analysis. Through searching for both invisible dark matter and visibly decaying long-lived signatures, LDMX will significantly advance the search for light dark matter and provide a broad exploration of the sub-GeV dark sector.
format	Preprint
id	arxiv_https___arxiv_org_abs_2604_14359
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Expected Sensitivity of the Light Dark Matter eXperiment to Long-Lived Dark Photons and Axion-Like Particles Akesson, Torsten Barton, Clay Bell, Charles Berzin, Elizabeth Brennan, Liam Bryngemark, Lene Kristian Curtis, Lincoln Daghlian, Patill Dukes, E. Craig Dutta, Valentina Echenard, Bertrand Ehrlich, Ralf Eichlersmith, Thomas Elén, Einar Furmanski, Andrew Ghrear, Majd Gignac, Matthew Graham, Matt Grieco, Chiara Group, Craig Herde, Hannah Herwig, Christian Hitlin, David G. Horoho, Tyler Incandela, Joseph Jay, Nathan Ketchum, Wesley Krnjaic, Gordan Lewis, Oscar Li, Yuze Mans, Jeremiah Suarez, Cristina Mantilla Masanam, Sanjit Metallo, Steven Middleton, Sophie Nelson, Timothy O'Dwyer, Rory Oyang, James Palit, Pritam Pascadlo, Jessica Peets, Emrys Pico, Luis Sarmiento Pöttgen, Ruth Rodriguez, Chelsea Satterthwaite, Lincoln Schuster, Philip Solt, Matt Tompkins, Lauren Toro, Natalia Tran, Nhan Vami, Tamas Wall, Kieran Wallin, Erik Whitbeck, Andrew Yoo, Jihoon Zhang, Danyi High Energy Physics - Experiment The Light Dark Matter eXperiment (LDMX) is an electron-beam fixed-target experiment primarily designed to achieve world-leading, model-independent sensitivity to sub-GeV dark matter particles. LDMX aims to identify dark sector particle production through the detection of events with substantial missing energy and momentum, a signature of invisible particles escaping detection. Beyond this primary objective, LDMX offers a complementary search strategy for long-lived, visibly decaying particles, such as dark photons and axion-like particles. We present the first detailed evaluation of the ability of LDMX to identify visibly decaying, long-lived particles that couple to electrons using a detailed simulation, based on the Geant4-toolkit, that incorporates realistic detection efficiencies and background levels. We demonstrate that LDMX can achieve a sensitivity that is competitive with other experiments that are currently running. The models explored in this paper are distinct and complementary to those probed in the LDMX flagship missing-momentum analysis. Through searching for both invisible dark matter and visibly decaying long-lived signatures, LDMX will significantly advance the search for light dark matter and provide a broad exploration of the sub-GeV dark sector.
title	Expected Sensitivity of the Light Dark Matter eXperiment to Long-Lived Dark Photons and Axion-Like Particles
topic	High Energy Physics - Experiment
url	https://arxiv.org/abs/2604.14359