期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 4, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP04(2020)003
关键词
Beyond Standard Model; Dark matter; Fixed target experiments
资金
- Joe and Pat Yzurdiaga endowed chair in experimental science
- NSF MRSEC [DMR-1720256]
- NSF [CNS-1725797]
- Royal Physiographic Society of Lund
- The L'Oreal-UNESCO For Women in Science in Sweden Prize
- Young Academy of Sweden
- U.S. Department of Energy [703 DE-AC02-76SF00515]
- Fermi Research Alliance, LLC [DE-AC02-07CH11359]
- U.S. Department of Energy, Office of Science, Office of High Energy Physics
- US Department of Energy [DE-SC0011925]
- Knut and Alice Wallenberg Foundation
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.
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