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

XAVIER BERTOU; CASTAÑEDA VAZQUEZ, ALEJANDRO; CHAVEZ, CLAUDIO; ESTRADA, JUAN; GUARDINCERRI, YANN; KAVNER, ALEXANDER; LETESSIER-SELVON; MOLINA, JORGE; RAMANATHAN, K.; SENGUL, C.; THOMAS, R.; TORRES MACHADO, DIEGO; JING ZHOU; DAN AMIDEI; GUSTAVO CANCELO; ALVARO E. CHAVARRIA; D'OLIVO, JUAN CARLOS; GAIOR, R. ; FEDERICO IZRAELEVITCH; LAWSON, IAN; MELLO, V. B. B.; PAOLO PRIVITERA; TOM SCHWARZ; SOFO HARO, MIGUEL; TIOUCHICHINE, E.; YOU, X.; ALEXIS AGUILAR-AREVALO; BUTNER, M.; CERVANTES VERGARA, BRENDA; MELLO NETO, J.R.T.; GUILLERMO FERNANDEZ MORONI; HERNANDEZ TORRES, PAMELA; BEN KILMINSTER; JUNHUI LIAO; PEÑA, J. R.; YOUSSEF SARKIS; SETTIMO, MARIANGELLA; TIFFENGER, JAVIER; FREDERIC TRILLAUD

PHYSICAL REVIEW D

AMER PHYSICAL SOC

Lugar: New York; Año: 2016 vol. 94

1550-7998

We present results of a dark matter search performed with a 0.6 kg d 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 (