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Portrait of RP

Ruth Pöttgen

Senior Lecturer

Portrait of RP

A high efficiency photon veto for the Light Dark Matter eXperiment


  • 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

Summary, in English

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.]


  • Particle and nuclear physics

Publishing year





Journal of High Energy Physics





Document type

Journal article




  • Accelerator Physics and Instrumentation
  • Subatomic Physics


  • Beyond Standard Model
  • Dark matter
  • Fixed target experiments




  • ISSN: 1126-6708