| Autor: |
Åkesson, Torsten, Blinov, Nikita, Bryngemark, Lene, Colegrove, Owen, Collura, Giulia, Dukes, Craig, Dutta, Valentina, Echenard, Bertrand, Eichlersmith, Thomas, Group, Craig, Hiltbrand, Joshua, Hitlin, David G., Incandela, Joseph, Krnjaic, Gordan, Lazaro, Juan, Li, Amina, Mans, Jeremiah, Masterson, Phillip, McCormick, Jeremy, Moreno, Omar |
| Předmět: |
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| Zdroj: |
Journal of High Energy Physics; Apr2020, Vol. 2020 Issue 4, p1-35, 35p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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