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<p>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 <i>y</i> of approximately 2 <i>×</i> 10<sup><i>−</i>13</sup> (5 <i>×</i> 10<sup><i>−</i>12</sup>) for a 1 MeV (10 MeV) dark matter candidate mass.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月19日

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  • 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

摘要

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.