Journal of High Energy Physics (Apr 2020)
A high efficiency photon veto for the Light Dark Matter eXperiment
- The LDMX collaboration,
- 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
Affiliations
- The LDMX collaboration
- Torsten Åkesson
- Lund University, Department of Physics
- Nikita Blinov
- Fermi National Accelerator Laboratory
- Lene Bryngemark
- Stanford University
- Owen Colegrove
- University of California at Santa Barbara
- Giulia Collura
- University of California at Santa Barbara
- Craig Dukes
- University of Virginia
- Valentina Dutta
- University of California at Santa Barbara
- Bertrand Echenard
- California Institute of Technology
- Thomas Eichlersmith
- University of Minnesota
- Craig Group
- University of Virginia
- Joshua Hiltbrand
- University of Minnesota
- David G. Hitlin
- California Institute of Technology
- Joseph Incandela
- University of California at Santa Barbara
- Gordan Krnjaic
- Fermi National Accelerator Laboratory
- Juan Lazaro
- University of California at Santa Barbara
- Amina Li
- University of California at Santa Barbara
- Jeremiah Mans
- University of Minnesota
- Phillip Masterson
- University of California at Santa Barbara
- Jeremy McCormick
- SLAC National Accelerator Laboratory
- Omar Moreno
- SLAC National Accelerator Laboratory
- Geoffrey Mullier
- Lund University, Department of Physics
- Akshay Nagar
- University of California at Santa Barbara
- Timothy Nelson
- SLAC National Accelerator Laboratory
- Gavin Niendorf
- University of California at Santa Barbara
- James Oyang
- California Institute of Technology
- Reese Petersen
- University of Minnesota
- Ruth Pöttgen
- Lund University, Department of Physics
- Philip Schuster
- SLAC National Accelerator Laboratory
- Harrison Siegel
- University of California at Santa Barbara
- Natalia Toro
- SLAC National Accelerator Laboratory
- Nhan Tran
- Fermi National Accelerator Laboratory
- Andrew Whitbeck
- Texas Tech University
- DOI
- https://doi.org/10.1007/JHEP04(2020)003
- Journal volume & issue
-
Vol. 2020,
no. 4
pp. 1 – 35
Abstract
Abstract 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.
Keywords
