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V. Derbin, A. Vishneva, A. W. Watson, B. Bottino, B. Hosseini, B. R. Hackett, B. Rossi, B. Schlitzer, C. Cical\\`o, C. Dionisi, C. Galbiati, C. Ghiano, C. Giganti, C. J. Martoff, C. L. Kendziora, C. Savarese, C. Stanford, C. Yang, C. Zhu, D. A. Semenov, D. D'Angelo, D. D'Urso, D. Franco, D. Hughes, D. Korablev, D. Sablone, E. Edkins, E. Pantic, E. Paoloni, E. Picciau, E. Segreto, E. V. Hungerford, E. V. Unzhakov, F. Calaprice, F. DiEusanio, F. Gabriele, F. Granato, F. Ortica, F. Ragusa, G. Batignani, G. Bonfini, G. Covone, G. DeFilippis, G. DeRosa, G. DiPietro, G. Fiorillo, G. K. Giovanetti, G. Koh, G. Korga, G. Longo, G. Testera, G. Zuzel, H. O. Back, H. Qian, H. Wang, I. F. M. Albuquerque, I. Kochanek, I. N. Machulin, J. Maricic, K. Biery, K. Fomenko, K. Herner, K. Keeter, K. Pelczar, L. Mapelli, L. Pagani, L. Pandola, M. Ave, M. Cadeddu, M. Cadoni, M. Caravati, M. Cariello, M. Carlini, M. Carpinelli, M. DeDeo, M. D'Incecco, M. Downing, M. D. Skorokhvatov, M. Gromov, M. Guan, M. Gulino, M. Kuss, M. LaCommara, M. Lai, M. Lissia, M. Morrocchi, M. M. Wojcik, M. Orsini, M. Pallavicini, M. Razeti, M. Rescigno, M. Verducci, M. Wada, N. Canci, N. Pelliccia, N. Rossi, O. Gorchakov, O. Samoylov, O. Smirnov, P. Cavalcante, P. D. Meyers, P. Humble, P. Musico, P. N. Singh, P. Trinchese, Q. Riffard, R. B. Vogelaar, R. Milincic, R. Tartaglia, S. Bussino, S. Catalanotti, S. Cavuoti, S. Davini, S. DeCecco, S. Giagu, S. M. Mari, S. Pordes, S. Sanfilippo, S. S. Poudel, S. Stracka, S. Westerdale, T. Alexander, The DarkSide-50 Collaboration: P. Agnes, T. J. Waldrop, T. N. Johnson, V. Bocci, V. Cataudella, V. Ippolito, V. N. Muratova, W. M. Bonivento, W. Sands, X. Li, X. Xiang, X. Xiao, Y. Guardincerri, Y. Suvorov, Y. Wang, Z. Ye","submitted_at":"2020-02-18T18:48:21Z","abstract_excerpt":"We reanalize data collected with the DarkSide-50 experiment and recently used to set limits on the spin-independent interaction rate of weakly interacting massive particles (WIMPs) on argon nuclei with an effective field theory framework. The dataset corresponds to a total (16660 $\\pm$ 270) kg d exposure using a target of low-radioactivity argon extracted from underground sources. We obtain upper limits on the effective couplings of the 12 leading operators in the nonrelativistic systematic expansion. 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