Results from the first use of low radioactivity argon in a dark matter search
Creators: name: The DarkSide Collaboration
name: Agnes, P.
name: Agostino, L.
name: Albuquerque, I. F. M.
name: Alexander, T.
name: Alton, A. K.
name: Arisaka, K.
name: Back, H. O.
name: Baldin, B.
name: Biery, K.
name: Bonfini, G.
name: Bossa, M.
name: Bottino, B.
name: Brigatti, A.
name: Brodsky, J.
name: Budano, F.
name: Bussino, S.
name: Cadeddu, M.
name: Cadonati, L.
name: Cadoni, M.
name: Calaprice, F.
name: Canci, N.
name: Candela, A.
name: Cao, H.
name: Cariello, M.
name: Carlini, M.
name: Catalanotti, S.
name: Cavalcante, P.
name: Chepurnov, A.
name: Cocco, A. G.
name: Covone, G.
name: Crippa, L.
name: D'Angelo, D.
name: D'Incecco, M.
name: Davini, S.
name: De Cecco, S.
name: De Deo, M.
name: De Vincenzi, M.
name: Derbin, A.
name: Devoto, A.
name: Di Eusanio, F.
name: Di Pietro, G.
name: Edkins, E.
name: Empl, A.
name: Fan, A.
name: Fiorillo, G.
name: Fomenko, K.
name: Forster, G.
name: Franco, D.
name: Gabriele, F.
name: Galbiati, C.
name: Giganti, C.
name: Goretti, A. M.
name: Granato, F.
name: Grandi, L.
name: Gromov, M.
name: Guan, M.
name: Guardincerri, Y.
name: Hackett, B. R.
name: Herner, K.
name: Hungerford, E. V.
name: Ianni, Al.
name: Ianni, An.
name: James, I.
name: Jollet, C.
name: Keeter, K.
name: Kendziora, C. L.
name: Kobychev, V.
name: Koh, G.
name: Korablev, D.
name: Korga, G.
name: Kubankin, A.
name: Li, X.
name: Lissia, M.
name: Lombardi, P.
name: Luitz, S.
name: Ma, Y.
name: Machulin, I. N.
name: Mandarano, A.
name: Mari, S. M.
name: Maricic, J.
name: Marini, L.
name: Martoff, C. J.
name: Meregaglia, A.
name: Meyers, P. D.
name: Miletic, T.
name: Milincic, R.
name: Montanari, D.
name: Monte, A.
name: Montuschi, M.
name: Monzani, M.
name: Mosteiro, P.
name: Mount, B. J.
name: Muratova, V. N.
name: Musico, P.
name: Napolitano, J.
name: Nelson, A.
name: Odrowski, S.
name: Orsini, M.
name: Ortica, F.
name: Pagani, L.
name: Pallavicini, M.
name: Pantic, E.
name: Parmeggiano, S.
name: Pelczar, K.
name: Pelliccia, N.
name: Perasso, S.
name: Pocar, A.
name: Pordes, S.
name: Pugachev, D. A.
name: Qian, H.
name: Randle, K.
name: Ranucci, G.
name: Razeto, A.
name: Reinhold, B.
name: Renshaw, A. L.
name: Romani, A.
name: Rossi, B.
name: Rossi, N.
name: Rountree, D.
name: Sablone, D.
name: Saggese, P.
name: Saldanha, R.
name: Sands, W.
name: Sangiorgio, S.
name: Savarese, C.
name: Segreto, E.
name: Semenov, D. A.
name: Shields, E.
name: Singh, P. N.
name: Skorokhvatov, M. D.
name: Smallcomb, M.
name: Smirnov, O.
name: Sotnikov, A.
name: Stanford, C.
name: Suvorov, Y.
name: Tartaglia, R.
name: Tatarowicz, J.
name: Testera, G.
name: Tonazzo, A.
name: Trinchese, P.
name: Unzhakov, E. V.
name: Vishneva, A.
name: Vogelaar, B.
name: Wada, M.
name: Walker, S.
name: Wang, H.
name: Wang, Y.
name: Watson, A. W.
name: Westerdale, S.
name: Wilhelmi, J.
name: Wojcik, M. M.
name: Xiang, X.
name: Xu, J.
name: Yang, C.
name: Yoo, J.
name: Zavatarelli, S.
name: Zec, A.
name: Zhong, W.
name: Zhu, C.
name: Zuzel, G.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Physics - Experiment (hep-ex)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Liquid argon is a bright scintillator with potent particle identification properties, making it an attractive target for direct-detection dark matter searches. The DarkSide-50 dark matter search here reports the first WIMP search results obtained using a target of low-radioactivity argon. DarkSide-50 is a dark matter detector, using two-phase liquid argon time projection chamber, located at the Laboratori Nazionali del Gran Sasso. The underground argon is shown to contain Ar-39 at a level reduced by a factor (1.4 +- 0.2) x 10^3 relative to atmospheric argon. We report a background-free null result from (2616 +- 43) kg d of data, accumulated over 70.9 live-days. When combined with our previous search using an atmospheric argon, the 90 % C.L. upper limit on the WIMP-nucleon spin-independent cross section based on zero events found in the WIMP search regions, is 2.0 x 10^-44 cm^2 (8.6 x 10^-44 cm^2, 8.0 x 10^-43 cm^2) for a WIMP mass of 100 GeV/c^2 (1 TeV/c^2 , 10 TeV/c^2).
description: Accepted by Phys. Rev. D