A high efficiency photon veto for the Light Dark Matter eXperiment

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Fixed-target experiments using primary electron beams can be powerful discovery tools for light dark matter in the sub-GeV mass range. The Light Dark Matter eXperiment (LDMX) is designed to measure missing momentum in high-rate electron fixed-target reactions with beam energies of 4 GeV to 16 GeV. A prerequisite for achieving several important sensitivity milestones is the capability to efficiently reject backgrounds associated with few-GeV bremsstrahlung, by twelve orders of magnitude, while maintaining high efficiency for signal. The primary challenge arises from events with photo-nuclear reactions faking the missing-momentum property of a dark matter signal. We present a methodology developed for the LDMX detector concept that is capable of the required rejection. By employing a detailed Geant4-based model of the detector response, we demonstrate that the sampling calorimetry proposed for LDMX can achieve better than 10−13 rejection of few-GeV photons. This suggests that the luminosity-limited sensitivity of LDMX can be realized at 4 GeV and higher beam energies. [Figure not available: see fulltext.]


  • Torsten Åkesson
  • Nikita Blinov
  • Lene Bryngemark
  • Owen Colegrove
  • Giulia Collura
  • Craig Dukes
  • Valentina Dutta
  • Bertrand Echenard
  • Thomas Eichlersmith
  • Craig Group
  • Joshua Hiltbrand
  • David G. Hitlin
  • Joseph Incandela
  • Gordan Krnjaic
  • Juan Lazaro
  • Amina Li
  • Jeremiah Mans
  • Phillip Masterson
  • Jeremy McCormick
  • Omar Moreno
  • Geoffrey Mullier
  • Akshay Nagar
  • Timothy Nelson
  • Gavin Niendorf
  • James Oyang
  • Reese Petersen
  • Ruth Pöttgen
  • Philip Schuster
  • Harrison Siegel
  • Natalia Toro
  • Nhan Tran
  • Andrew Whitbeck
  • The LDMX collaboration
Enheter & grupper
Externa organisationer
  • Fermi National Accelerator Laboratory
  • Stanford University
  • University of California, Santa Barbara
  • University of Virginia
  • California Institute of Technology
  • University of Minnesota system
  • SLAC National Accelerator Laboratory
  • Texas Tech University

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Acceleratorfysik och instrumentering


TidskriftJournal of High Energy Physics
Utgåva nummer4
StatusPublished - 2020
Peer review utfördJa