Dark matter, millicharges, axion and scalar particles, gauge bosons, and other new physics with LDMX

By A. Berlin, N. Blinov, G. Krnjaic, P. Schuster, N. Toro. Physical Review D, 2018

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The proposed LDMX experiment would provide roughly a meter-long region of instrumented tracking and calorimetry that acts as a beam stop for multi-GeV electrons in which each electron is tagged and its evolution measured. This would offer an unprecedented opportunity to access both collider-invisible and ultrashort-lifetime decays of new particles produced in electron (or muon) nuclear fixed-target collisions. In this paper, we show that the missing momentum channel and displaced decay signals in such an experiment could provide world-leading sensitivity to sub-GeV dark matter, millicharged particles, and visibly or invisibly decaying axions, scalars, dark photons, and a range of other new physics scenarios.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1370e1448473d4160b3673923e757e64ceebf21e