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Results from the first use of low radioactivity argon in a dark matter search

2016; American Physical Society; Volume: 93; Issue: 8 Linguagem: Inglês

10.1103/physrevd.93.081101

2470-0037

P. Agnes, L. Agostino, I. F. M. Albuquerque, T. Alexander, A. K. Alton, K. Arisaka, H. O. Back, B. Baldin, K. Biery, G. Bonfini, M. Bossa, B. Bottino, A. Brigatti, J. Brodsky, F. Budano, S. Bussino, M. Cadeddu, L. Cadonati, Mariano Cadoni, F. Calaprice, N. Canci, A. Candela, H. Cao, M. Cariello, M. Carlini, S. Catalanotti, P. Cavalcante, A. Chepurnov, A.G. Cocco, G. Covone, Luca Crippa, D. D’Angelo, M. D’Incecco, S. Davini, S. De Cecco, M. De Deo, M. De Vincenzi, A. Derbin, A. Devoto, F. Di Eusanio, G. Di Pietro, E. Edkins, A. Empl, A. Fan, G. Fiorillo, K. Fomenko, G. Förster, D. Franco, F. Gabriele, C. Galbiati, C. Giganti, A. M. Goretti, F. Granato, L. Grandi, M. Gromov, M. Guan, Y. Guardincerri, B. R. Hackett, K. Herner, E.V. Hungerford, Aldo Ianni, An. Ianni, I. James, C. Jollet, K. Keeter, C. Kendziora, V. Kobychev, G. Koh, D. Korablëv, G. Korga, A. Kubankin, X. Li, M. Lissia, P. Lombardi, S. Luitz, Y. Ma, I. Machulin, A. Mandarano, S. M. Mari, J. Maricic, L. Marini, C. J. Martoff, A. Meregaglia, P. D. Meyers, T. Miletic, R. Milinčić, D. Montanari, A. Monte, M. Montuschi, M. E. Monzani, P. Mosteiro, B. J. Mount, V. Muratova, P. Musico, J. Napolitano, A. Nelson, S. Odrowski, M. Orsini, F. Ortica, L. Pagani, M. Pallavicini, E. Pantic, S. Parmeggiano, K. Pelczar, N. Pelliccia, S. Perasso, A. Pocar, S. Pordes, D. A. Pugachev, H. Qian, K. Randle, G. Ranucci, A. Razeto, B. Reinhold, A. Renshaw, A. Romani, B. Rossi, N. Rossi, S.D. Rountree, D. Sablone, P. Saggese, R. Saldanha, W. Sands, S. Sangiorgio, C. Savarese, E. Segreto, Д. А. Семенов, E. Shields, P. Singh, M. D. Skorokhvatov, O. Smirnov, A. Sotnikov, C. Stanford, Y. Suvorov, R. Tartaglia, J. Tatarowicz, G. Testera, A. Tonazzo, P. Trinchese, E. Unzhakov, A. Vishneva, B. Vogelaar, M. Wada, Susan Walker, H. Wang, Yi Wang, A. Watson, S. Westerdale, J. Wilhelmi, M. Wójcik, X. Xiang, Jing Xu, C. Yang, J. Yoo, S. Zavatarelli, A. Zec, W. L. Zhong, C. Zhu, G. Zuzel,

Particle physics theoretical and experimental studies

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).