/ astro-ph.CO FERMILAB-PUB-15-436-AE-E

Low Radioactivity Argon Dark Matter Search Results from the DarkSide-50 Experiment

Agnes, P. (DAPNIA, Saclay) ; Agostino, L. (Paris U., VI-VII) ; Albuquerque, I.F.M. (Sao Paulo U.) ; Alexander, T. (Fermilab) ; Alton, A.K. (Augustana U. Coll.) ; Arisaka, K. (UCLA) ; Back, H.O. (PNL, Richland) ; Baldin, B. (Fermilab) ; Biery, K. (Fermilab) ; Bonfini, G. (Gran Sasso) ; Bossa, M. (Gran Sasso) ; Bottino, B. (INFN, Genoa) ; Brigatti, A. (INFN, Milan) ; Brodsky, J. (Princeton U.) ; Budano, F. (Rome U.) ; Bussino, S. (Rome U.) ; Cadeddu, M. (INFN, Cagliari) ; Cadonati, L. (Massachusetts U., Amherst) ; Cadoni, M. (INFN, Cagliari) ; Calaprice, F. (Princeton U.) ; Canci, N. (Gran Sasso) ; Candela, A. (Gran Sasso) ; Cao, H. (Princeton U.) ; Cariello, M. (INFN, Genoa) ; Carlini, M. (Gran Sasso) ; Catalanotti, S. (INFN, Naples) ; Cavalcante, P. (Gran Sasso) ; Chepurnov, A. (Moscow State U.) ; Cocco, A.G. (INFN, Naples) ; Covone, G. (INFN, Naples) ; Crippa, L. (INFN, Milan) ; D'Angelo, D. (INFN, Milan) ; D'Incecco, M. (Gran Sasso) ; Davini, S. (Gran Sasso) ; De Cecco, S. (Paris U., VI-VII) ; De Deo, M. (Gran Sasso) ; De Vincenzi, M. (Rome U.) ; Derbin, A. (Kurchatov Inst., Moscow) ; Devoto, A. (INFN, Cagliari) ; Di Eusanio, F. (Princeton U.) ; Di Pietro, G. (INFN, Milan) ; Edkins, E. (Hawaii U.) ; Empl, A. (Houston U.) ; Fan, A. (UCLA) ; Fiorillo, G. (INFN, Naples) ; Fomenko, K. (Dubna, JINR) ; Forster, G. (Fermilab) ; Franco, D. (DAPNIA, Saclay) ; Gabriele, F. (Gran Sasso) ; Galbiati, C. (Gran Sasso) ; Giganti, C. (Paris U., VI-VII) ; Goretti, A.M. (Gran Sasso) ; Granato, F. (Temple U.) ; Grandi, L. (Chicago U., EFI) ; Gromov, M. (Moscow State U.) ; Guan, M. (Beijing, Inst. High Energy Phys.) ; Guardincerri, Y. (Fermilab) ; Hackett, B.R. (Hawaii U.) ; Herner, K. (Fermilab) ; Hungerford, E.V. (Houston U.) ; Ianni, Al. (Gran Sasso) ; Ianni, An. (Gran Sasso) ; James, I. (Rome U.) ; Jollet, C. (Louis Pasteur U., Strasbourg I) ; Keeter, K. (Black Hills State U.) ; Kendziora, C.L. (Fermilab) ; Kobychev, V. (Kiev, INR) ; Koh, G. (Princeton U.) ; Korablev, D. (Dubna, JINR) ; Korga, G. (Gran Sasso) ; Kubankin, A. (Belgorod State U.) ; Li, X. (Princeton U.) ; Lissia, M. (INFN, Cagliari) ; Lombardi, P. (INFN, Milan) ; Luitz, S. (SLAC) ; Ma, Y. (Beijing, Inst. High Energy Phys.) ; Machulin, I.N. (Moscow Phys. Eng. Inst.) ; Mandarano, A. (Gran Sasso) ; Mari, S.M. (Rome U.) ; Maricic, J. (Hawaii U.) ; Marini, L. (INFN, Genoa) ; Martoff, C.J. (Temple U.) ; Meregaglia, A. (Louis Pasteur U., Strasbourg I) ; Meyers, P.D. (Princeton U.) ; Miletic, T. (Temple U.) ; Milincic, R. (Hawaii U.) ; Montanari, D. (Fermilab) ; Monte, A. (Massachusetts U., Amherst) ; Montuschi, M. (Gran Sasso) ; Monzani, M. (SLAC) ; Mosteiro, P. (Princeton U.) ; Mount, B.J. (Black Hills State U.) ; Muratova, V.N. (Kurchatov Inst., Moscow) ; Musico, P. (INFN, Genoa) ; Napolitano, J. (Temple U.) ; Nelson, A. (Princeton U.) ; Odrowski, S. (Gran Sasso) ; Orsini, M. (Gran Sasso) ; Ortica, F. (INFN, Perugia) ; Pagani, L. (INFN, Genoa) ; Pallavicini, M. (INFN, Genoa) ; Pantic, E. (UC, Davis) ; Parmeggiano, S. (INFN, Milan) ; Pelczar, K. (Jagiellonian U.) ; Pelliccia, N. (INFN, Perugia) ; Perasso, S. (DAPNIA, Saclay) ; Pocar, A. (Princeton U.) ; Pordes, S. (Fermilab) ; Pugachev, D.A. (Moscow Phys. Eng. Inst.) ; Qian, H. (Princeton U.) ; Randle, K. (Massachusetts U., Amherst) ; Ranucci, G. (INFN, Milan) ; Razeto, A. (Princeton U.) ; Reinhold, B. (Hawaii U.) ; Renshaw, A.L. (Houston U.) ; Romani, A. (INFN, Perugia) ; Rossi, B. (Princeton U.) ; Rossi, N. (Gran Sasso) ; Rountree, D. (Virginia Tech.) ; Sablone, D. (Gran Sasso) ; Saggese, P. (INFN, Milan) ; Saldanha, R. (Chicago U., EFI) ; Sands, W. (Princeton U.) ; Sangiorgio, S. (LLNL, Livermore) ; Savarese, C. (Gran Sasso) ; Segreto, E. (Campinas State U.) ; Semenov, D.A. (Kurchatov Inst., Moscow) ; Shields, E. (Princeton U.) ; Singh, P.N. (Houston U.) ; Skorokhvatov, M.D. (Moscow Phys. Eng. Inst.) ; Smirnov, O. (Dubna, JINR) ; Sotnikov, A. (Dubna, JINR) ; Stanford, C. (Princeton U.) ; Suvorov, Y. (Kurchatov Inst., Moscow) ; Tartaglia, R. (Gran Sasso) ; Tatarowicz, J. (Temple U.) ; Testera, G. (INFN, Genoa) ; Tonazzo, A. (DAPNIA, Saclay) ; Trinchese, P. (Naples U.) ; Unzhakov, E.V. (Kurchatov Inst., Moscow) ; Vishneva, A. (Dubna, JINR) ; Vogelaar, B. (Virginia Tech.) ; Wada, M. (Princeton U.) ; Walker, S. (INFN, Naples) ; Wang, H. (UCLA) ; Wang, Y. (Beijing, GUCAS) ; Watson, A.W. (Temple U.) ; Westerdale, S. (Princeton U.) ; Wilhelmi, J. (Temple U.) ; Wojcik, M.M. (Jagiellonian U.) ; Xiang, X. (Princeton U.) ; Xu, J. (Princeton U.) ; Yang, C. (Beijing, Inst. High Energy Phys.) ; Yoo, J. (Fermilab) ; Zavatarelli, S. (INFN, Genoa) ; Zec, A. (Massachusetts U., Amherst) ; Zhong, W. (Beijing, Inst. High Energy Phys.) ; Zhu, C. (Princeton U.) ; Zuzel, G. (Jagiellonian U.)

Pages: 7

Abstract: The DarkSide-50 dark matter search reports the first results obtained using a target of low-radioactivity argon extracted from underground sources. The experiment is located at the Laboratori Nazionali del Gran Sasso and uses a two-phase time projection chamber as a detector. A total of 155 kg of low radioactivity argon has been obtained, and we have determined that underground argon is depleted in $^{39}Ar$ by a factor ($1.4 \pm 0.2$) x $10^3$ relative to atmospheric argon. The underground argon is also found to contain ($2.05 \pm 0.13$) mBq/kg of $^{85}Kr$. We find no evidence for dark matter in the form of WIMPs in 70.9 live-days of data with a fiducial mass of ($36.9 \pm 0.6$) kg. When combined with our preceding search with an atmospheric argon target, we set a 90% C.L. upper limit on the WIMP-nucleon spin-independent cross section of $2.0 x 10^{-44} cm^2$ ($8.6 x 10^{-44} cm^2, 8.0 x 10^{-43} cm^2$) for a WIMP mass of 100 $GeV/c^2$ ($1 TeV/c^2, 10 TeV/c^2$).

Web-Page: http://inspirehep.net/record/1395953/files/DSf-UArEfficiencyStCut.png; http://inspirehep.net/record/1395953/files/DSf-UAr2015DMSStwoCut.png; http://inspirehep.net/record/1395953/files/DSf-UAr2015DMSStdCut.png; http://inspirehep.net/record/1395953/files/DSf-AArUArSpectraDriftField.png; http://inspirehep.net/record/1395953/files/DSf-UAr2015Exclusion.png; http://inspirehep.net/record/1395953/files/DSf-AArUArSpectraNullField.png; http://inspirehep.net/record/1395953/files/DSf-UArAmBeDMSStCut.png; http://inspirehep.net/record/1395953/files/arXiv:1510.00702.pdf; http://lss.fnal.gov/archive/2015/pub/fermilab-pub-15-436-ae-e.pdf

Note: 7 pages, 4 figures. Submitted to PRL

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 Record created 2015-11-02, last modified 2015-11-02

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