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Experiments aiming to directly detect dark matter (DM) particles have yet tomake robust detections, thus underscoring the need for complementary approachessuch as searches for new particles at colliders, and indirect DM searches incosmic-ray spectra. Low energy (< 0.25 GeV/n) cosmic-ray antiparticles such asantideuterons are strong candidates for probing DM models, as the yield ofthese particles from DM processes can exceed the astrophysical background bymore than two orders of magnitude. The General Antiparticle Spectrometer(GAPS), a balloon borne cosmic-ray detector, will perform an ultra-lowbackground measurement of the cosmic antideuteron flux in the regime < 0.25GeV/n, which will constrain a wide range of DM models. GAPS will also detectapproximately 1000 antiprotons in an unexplored energy range throughout onelong duration balloon (LDB) flight, which will constrain < 10 GeV DM models andvalidate the GAPS detection technique. Unlike magnetic spectrometers, GAPSrelies on the formation of an exotic atom within the tracker in order toidentify antiparticles. The GAPS tracker consists of ten layers oflithium-drifted silicon detectors which record dE/dx deposits from primary andnuclear annihilation product tracks, as well as measure the energy of theexotic atom deexcitation X-rays. A two-layer, plastic scintillator time offlight (TOF) system surrounds the tracker and measures the particle velocity,dE/dx deposits, and provides a fast trigger to the tracker. The nuclearannihilation product multiplicity, deexcitation X-ray energies, TOF, andstopping depth are all used together to discern between antiparticle species.This presentation provided an overview of the GAPS experiment, an update on theconstruction of the tracker and TOF systems, and a summary of the expectedperformance of GAPS in light of the upcoming LDB flight from McMurdo Station,Antarctica in 2020.

An Indirect Dark Matter Search Using Cosmic-Ray Antiparticles with GAPS