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We report on the search for dark matter WIMPs in the mass range below 10GeV/c$^2$, from the analysis of the entire dataset acquired with alow-radioactivity argon target by the DarkSide-50 experiment at LNGS. The newanalysis benefits from more accurate calibration of the detector response,improved background model, and better determination of systematicuncertainties, allowing us to accurately model the background rate and spectradown to 0.06 keV$_{er}$. A 90% C.L. exclusion limit for the spin-independentcross section of 3 GeV/c$^2$ mass WIMP on nucleons is set at6$\times$10$^{-43}$ cm$^2$, about a factor 10 better than the previousDarkSide-50 limit. This analysis extends the exclusion region forspin-independent dark matter interactions below the current experimentalconstraints in the $[1.2, 3.6]$ GeV/c$^2$ WIMP mass range.

Search for low-mass dark matter WIMPs with 12 ton-day exposure of DarkSide-50