Search for low-mass WIMPs in a 0.6 kg day exposure of the DAMIC experiment at SNOLAB

25 Jul 2016 · A. Aguilar-Arevalo, D. Amidei, X. Bertou, M. Butner, G. Cancelo, A. Castañeda Vázquez, B. A. Cervantes Vergara, A. E. Chavarria, C. R. Chavez, J. R. T. de Mello Neto, J. C. D'Olivo, J. Estrada, G. Fernandez Moroni, R. Gaïor, Y. Guandincerri, K. P. Hernández Torres, F. Izraelevitch, A. Kavner, B. Kilminster, I. Lawson, A. Letessier-Selvon, J. Liao, J. Molina, J. R. Peña, P. Privitera, K. Ramanathan, Y. Sarkis, T. Schwarz, C. Sengul, M. Settimo, M. Sofo Haro, R. Thomas, J. Tiffenberg, E. Tiouchichine, D. Torres Machado, F. Trillaud, X. You, J. Zhou ·

We present results of a dark matter search performed with a 0.6 kg day exposure of the DAMIC experiment at the SNOLAB underground laboratory. We measure the energy spectrum of ionization events in the bulk silicon of charge-coupled devices down to a signal of 60 eV electron equivalent. The data are consistent with radiogenic backgrounds, and constraints on the spin-independent WIMP-nucleon elastic-scattering cross section are accordingly placed. A region of parameter space relevant to the potential signal from the CDMS-II Si experiment is excluded using the same target for the first time. This result obtained with a limited exposure demonstrates the potential to explore the low-mass WIMP region (<10 GeV/$c^{2}$) of the upcoming DAMIC100, a 100 g detector currently being installed in SNOLAB.

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Search for low-mass WIMPs in a 0.6 kg day exposure of the DAMIC experiment at SNOLAB

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