Browsing by Author "Back, H. O."

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    CALIS - A CALibration Insertion System for the DarkSide-50 dark matter search experiment
    Agnes, P.; Albuquerque, I. F. M.; Alexander, T.; Alton, A. K.; Asner, D. M.; Back, H. O.; Baldin, B.; Biery, K.; Bocci, V.; Bonfini, G.; Bonivento, W.; Bossa, M.; Bottino, B.; Brigatti, A.; Brodsky, J.; Budano, F.; Bussino, S.; Cadeddu, M.; Cadonati, L.; Cadoni, M.; Calaprice, F.; Canci, N.; Candela, A.; Caravati, M.; Cariello, M.; Carlini, M.; Catalanotti, S.; Cavalcante, P.; Chepurnov, A.; Cicalo, C.; Cocco, A. G.; Covone, G.; D'Angelo, D.; D'Incecco, M.; Davini, S.; De Cecco, S.; De Deo, M.; De Vincenzi, M.; Derbin, A. V.; Devoto, A.; Di Eusanio, F.; Di Pietro, G.; Dionisi, C.; Edkins, E.; Empl, A.; Fan, A.; Fiorillo, G.; Fomenko, K.; Forster, G.; Franco, D.; Gabriele, Federico; Galbiati, C.; Giagu, S.; Giganti, C.; Giovanetti, G. K.; Goretti, A. M.; Granato, F.; Grandi, L.; Gromov, M.; Guan, M.; Guardincerri, Y.; Hackett, B. R.; Herner, K.; Hughes, D.; Humble, P.; Hungerford, Ed V.; Ianni, A.; Ianni, A.; James, I.; Johnson, T. N.; Jollet, C.; Keeter, K.; Kendziora, C. L.; Koh, G.; Korablev, D.; Korga, G.; Kubankin, A.; Li, X.; Lissia, M.; Loer, B.; Lombardi, Paolo; Longo, G.; Ma, Y.; Machado, A. A.; Machulin, I. N.; Mandarano, A.; Mari, S. M.; Maricic, Jelena; Marini, L.; Martoff, C. J.; Meregaglia, A.; Meyers, P. D.; Milincic, R.; Miller, J. D.; Montanari, D.; Monte, A.; Mount, B. J.; Muratova, V. N.; Musico, P.; Napolitano, J.; Agasson, A. Navrer; Odrowski, S.; Orsini, M.; Ortica, F.; Pagani, L.; Pallavicini, M.; Pantic, E.; Parmeggiano, S.; Pelczar, K.; Pelliccia, N.; Pocar, A.; Pordes, S.; Pugachev, D. A.; Qian, H.; Randle, K.; Ranucci, G.; Razeti, M.; Razeto, A.; Reinhold, B.; Renshaw, A. L.; Rescigno, M.; Riffard, Q.; Romani, A.; Rossi, B.; Rossi, Nicola; Rountree, D.; Sablone, D.; Saggese, P.; Saldanha, R.; Sands, W.; Savarese, C.; Schlitzer, B.; Segreto, E.; Semenov, D. A.; Shields, E.; Singh, P. N.; Skorokhvatov, Mikhail D.; Smirnov, O. Y.; Sotnikov, A.; Stanford, C.; Suvorov, Yura; Tartaglia, R.; Tatarowicz, J.; Testera, G.; Tonazzo, A.; Trinchese, P.; Unzhakov, E. V.; Verducci, M.; Vishneva, A.; Vogelaar, R. Bruce; Wada, M.; Walker, S.; Wang, H.; Wang, Y.; Watson, A. W.; Westerdale, S.; Wilhelmi, J.; Wojcik, M. M.; Xiang, Xi.; Xiao, X.; Xu, J.; Yang, C.; Zec, A.; Zhong, W.; Zhu, C.; Zuzel, G. (2017-12)
    This paper describes the design, fabrication, commissioning and use of a CALibration source Insertion System (CALIS) in the DarkSide-50 direct dark matter search experiment. CALIS deploys radioactive sources into the liquid scintillator veto to characterize the detector response and detection efficiency of the DarkSide-50 Liquid Argon Time Projection Chamber, and the surrounding 30 t organic liquid scintillator neutron veto. It was commissioned in September 2014 and has been used successfully in several gamma and neutron source campaigns since then. A description of the hardware and an excerpt of calibration analysis results are given below.
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    The DarkSide Multiton Detector for the Direct Dark Matter Search
    Aalseth, C. E.; Agnes, P.; Alton, A. K.; Arisaka, K.; Asner, D. M.; Back, H. O.; Baldin, B.; Biery, K.; Bonfini, G.; Bossa, M.; Brigatti, A.; Brodsky, J.; Budano, F.; Cadonati, L.; Cadoni, M.; Calaprice, F.; Canci, N.; Candela, A.; Cao, H.; Cariello, M.; Cavalcante, P.; Chepurnov, A.; Cocco, A. G.; Condon, C.; Crippa, L.; D'Angelo, D.; D'Incecco, M.; Davini, S.; De Deo, M.; Derbin, A. V.; Devoto, A.; Di Eusanio, F.; Edkins, E.; Empl, A.; Fan, A.; Fiorillo, G.; Fomenko, K.; Forster, G.; Foxe, M.; Franco, D.; Gabriele, Federico; Galbiati, C.; Goretti, A.; Grandi, L.; Gromov, M.; Guan, M. Y.; Guardincerri, Y.; Hackett, B.; Herner, K.; Hime, A.; Humble, P.; Hungerford, Ed V.; Ianni, A.; Ianni, A.; Jaffe, D. E.; Jollet, C.; Keeter, K.; Kendziora, C. L.; Kidner, S.; Kobychev, V.; Koh, G.; Korablev, D.; Korga, G.; Kurlej, A.; Li, P. X.; Lissia, M.; Lombardi, Paolo; Ludhova, L.; Luitz, S.; Lukyachenko, G.; Ma, Y. Q.; Machulin, I. N.; Mandarano, A.; Mari, S. M.; Maricic, Jelena; Marini, L.; Markov, D.; Martoff, J.; Meregaglia, A.; Meroni, E.; Meyers, P. D.; Miletic, T.; Milincic, R.; Montuschi, M.; Monzani, M. E.; Mosteiro, P.; Mount, B.; Muratova, V. N.; Musico, P.; Montanari, D.; Nelson, A.; Odrowski, S.; Odrzywolek, A.; Orrell, J. L.; Orsini, M.; Ortica, F.; Pagani, L.; Pallavicini, M.; Pantic, E.; Parmeggiano, S.; Parsells, B.; Pelczar, K.; Pelliccia, N.; Perasso, S.; Perasso, L.; Pocar, A.; Pordes, S.; Pugachev, D. A.; Qian, H.; Randle, K.; Ranucci, G.; Razeto, A.; Recine, K.; Reinhold, B.; Renshaw, A. L.; Romani, A.; Rossi, Nicola; Rossi, B.; Rountree, S. D.; Sablone, D.; Saggese, P.; Saldanha, R.; Sands, W.; Sangiorgio, S.; Segreto, E.; Semenov, D. A.; Shields, E.; Skorokhvatov, Mikhail D.; Smallcomb, M.; Smirnov, O. Y.; Sotnikov, A.; Suvurov, Y.; Tartaglia, R.; Tatarowicz, J.; Testera, G.; Tonazzo, A.; Unzhakov, E. V.; Vogelaar, R. Bruce; Wada, M.; Walker, S. E.; Wang, H.; Wang, Y.; Watson, A. W.; Westerdale, S.; Williams, R.; Wojcik, M. M.; Xu, J.; Yang, C. G.; Yoo, J.; Yu, B.; Zavatarelli, S.; Zhong, W. L.; Zuzel, G. (Hindawi, 2015-01-20)
    Although the existence of dark matter is supported by many evidences, based on astrophysical measurements, its nature is still completely unknown. One major candidate is represented by weakly interacting massive particles (WIMPs), which could in principle be detected through their collisions with ordinary nuclei in a sensitive target, producing observable low-energy (ud_less_than100 keV) nuclear recoils. The DarkSide program aims at the WIPMs detection using a liquid argon time projection chamber (LAr-TPC). In this paper we quickly review the DarkSide program focusing in particular on the next generation experiment DarkSide-G2, a 3.6-ton LAr-TPC. The different detector components are described as well as the improvements needed to scale the detector from DarkSide-50 (50 kg LAr-TPC) up to DarkSide-G2. Finally, the preliminary results on background suppression and expected sensitivity are presented.
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    Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons
    Liu, J.; Mendenhall, M. P.; Holley, A. T.; Back, H. O.; Bowles, T. J.; Broussard, L. J.; Carr, Rachel E.; Clayton, S.; Currie, S.; Filippone, B. W.; Garcia, A.; Geltenbort, P.; Hickerson, K. P.; Hoagland, J.; Hogan, G. E.; Hona, B.; Ito, T. M.; Liu, C. Y.; Makela, M.; Mammei, R. R.; Martin, J. W.; Melconian, D.; Morris, C. L.; Pattie, R. W.; Galvan, A. P.; Pitt, M. L.; Plaster, B.; Ramsey, J. C.; Rios, R.; Russell, R.; Saunders, A.; Seestrom, S. J.; Sondheim, W. E.; Tatar, E.; Vogelaar, R. Bruce; VornDick, B.; Wrede, C.; Yan, H.; Young, A. R.; Ucna Collaboration (American Physical Society, 2010-10-29)
    A precise measurement of the neutron decay beta asymmetry A(0) has been carried out using polarized ultracold neutrons from the pulsed spallation ultracold neutron source at the Los Alamos Neutron Science Center. Combining data obtained in 2008 and 2009, we report A(0) = -0.119 66 +/- 0.000 89(-0.001 40)(+0.001 23), from which we determine the ratio of the axial- vector to vector weak coupling of the nucleon gA/gV = -1.275 90(-0.004 45)(+0.004 09).
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    First Measurement of the Neutron beta Asymmetry with Ultracold Neutrons
    Pattie, R. W.; Anaya, J.; Back, H. O.; Boissevain, J. G.; Bowles, T. J.; Broussard, L. J.; Carr, Rachel E.; Clark, D. J.; Currie, S.; Du, S.; Filippone, B. W.; Geltenbort, P.; Garcia, A.; Hawari, A.; Hickerson, K. P.; Hill, R.; Hino, M.; Hoedl, S. A.; Hogan, G. E.; Holley, A. T.; Ito, T. M.; Kawai, T.; Kirch, K.; Kitagaki, S.; Lamoreaux, S. K.; Liu, C. Y.; Liu, J.; Makela, M.; Mammei, R. R.; Martin, J. W.; Melconian, D.; Meier, N.; Mendenhall, M. P.; Morris, C. L.; Mortensen, R.; Pichlmaier, A.; Pitt, M. L.; Plaster, B.; Ramsey, J. C.; Rios, R.; Sabourov, K.; Sallaska, A. L.; Saunders, A.; Schmid, R.; Seestrom, S. J.; Servicky, C.; Sjue, S. K. L.; Smith, D.; Sondheim, W. E.; Tatar, E.; Teasdale, W.; Terai, C.; Tipton, B.; Utsuro, M.; Vogelaar, R. Bruce; Wehring, B. W.; Xu, Y. P.; Young, A. R.; Yuan, J.; Ucna Collaboration (American Physical Society, 2009-01-09)
    We report the first measurement of an angular correlation parameter in neutron beta decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for similar to 30 s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage spin flipper and enter a decay volume, situated within a 1 T field in a 2 x 2 pi solenoidal spectrometer. We determine a value for the beta-asymmetry parameter A(0) = -0.1138 +/- 0.0046 +/- 0.0021.
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    Measurement of isotopic separation of argon with the prototype of the cryogenic distillation plant Aria for dark matter searches
    Aaron, E.; Agnes, P.; Ahmad, I.; Albergo, S.; Albuquerque, I. F. M.; Alexander, T.; Alton, A. K.; Amaudruz, P.; Atzori Corona, M.; Ave, M.; Avetisov, I. C.; Azzolini, O.; Back, H. O.; Balmforth, Z.; Barrado, A.; Barrillon, P.; Basco, A.; Batignani, G.; Bocci, V.; Bonivento, W. M.; Bottino, B.; Boulay, M. G.; Busto, J.; Cadeddu, M.; Caminata, A.; Canci, N.; Capra, A.; Caprioli, S.; Caravati, M.; Cargioli, N.; Carlini, M.; Castello, P.; Cavalcante, P.; Cavuoti, S.; Cebrian, S.; Cela Ruiz, J. M.; Chashin, S.; Chepurnov, A.; Chyhyrynets, E.; Cifarelli, L.; Cintas, D.; Citterio, M.; Cleveland, B.; Cocco, V.; Conde Vilda, E.; Consiglio, L.; Copello, S.; Covone, G.; Czubak, M.; D’Aniello, M.; D’Auria, S.; Da Rocha Rolo, M. D.; Davini, S.; De Cecco, S.; De Guido, G.; De Gruttola, D.; De Pasquale, S.; De Rosa, G.; Dellacasa, G.; Derbin, A. V.; Devoto, A.; Di Capua, F.; Di Noto, L.; Di Stefano, P.; Dolganov, G.; Dordei, F.; Ellingwood, E.; Erjavec, T.; Farenzena, S.; Fernandez Diaz, M.; Fiorillo, G.; Franchini, P.; Franco, D.; Funicello, N.; Gabriele, F.; Gahan, D.; Galbiati, C.; Gallina, G.; Gallus, G.; Garbini, M.; Garcia Abia, P.; Gendotti, A.; Ghiano, C.; Giganti, C.; Giovanetti, G. K.; Goicoechea Casanueva, V.; Gola, A.; Grauso, G.; Grilli di Cortona, G.; Grobov, A.; Gromov, M.; Guan, M.; Guerzoni, M.; Gulino, M.; Guo, C.; Hackett, B. R.; Hallin, A. L.; Hamer, A.; Haranczyk, M.; Hessel, T.; Hill, S.; Horikawa, S.; Hubaut, F.; Hucker, J.; Hugues, T.; Ianni, An.; Ippolito, V.; Jillings, C.; Jois, S.; Kachru, P.; Kemp, A. A.; Kendziora, C. L.; Kimura, M.; Kochanek, I.; Kondo, K.; Korga, G.; Koulosousas, S.; Kubankin, A.; Kuss, M.; Kuźniak, M.; La Commara, M.; Lai, M.; Lami, N.; Le Guirriec, E.; Leason, E.; Leoni, A.; Lidey, L.; Lippi, F.; Lissia, M.; Luzzi, L.; Lychagina, O.; Maccioni, N.; Macfadyen, O.; Machulin, I. N.; Manecki, S.; Manthos, I.; Mapelli, L.; Margotti, A.; Mari, S. M.; Mariani, Camillo; Maricic, J.; Marini, A.; Martínez, M.; Martoff, C. J.; Mascia, M.; Masoni, A.; Matteucci, G.; Mavrokoridis, K.; Maxia, C.; McDonald, A. B.; Messina, A.; Milincic, R.; Mitra, A.; Moharana, A.; Moioli, S.; Monroe, J.; Moretti, E.; Morrocchi, M.; Mróz, T.; Muratova, V. N.; Muscas, C.; Musico, P.; Nania, R.; Nessi, M.; Nikolopoulos, K.; Nowak, J.; Olchansky, K.; Oleinik, A.; Oleynikov, V.; Organtini, P.; de Solórzano, A. O.; Pagani, L.; Pallavicini, M.; Pandola, L.; Pantic, E.; Paoloni, E.; Paternoster, G.; Pegoraro, P. A.; Pelczar, K.; Pellegrini, L. A.; Pellegrino, C.; Pesudo, V.; Piacentini, S.; Pietrofaccia, L.; Pino, N.; Pocar, A.; Poehlmann, D. M.; Pordes, S.; Pralavorio, P.; Price, D.; Ragusa, F.; Ramachers, Y.; Razeti, M.; Renshaw, A. L.; Rescigno, M.; Retiere, F.; Rignanese, L. P.; Ripoli, C.; Rivetti, A.; Roberts, A.; Roberts, C.; Rode, J.; Rogers, G.; Romero, L.; Rossi, M.; Rubbia, A.; Sabia, M. A.; Sabiu, G. M.; Salomone, P.; Sandford, E.; Sanfilippo, S.; Santone, D.; Santorelli, R.; Savarese, C.; Scapparone, E.; Schillaci, G.; Schukman, F.; Scioli, G.; Simeone, M.; Skensved, P.; Skorokhvatov, M. D.; Smirnov, O.; Smirnova, T.; Smith, B.; Spadoni, F.; Spangenberg, M.; Stefanizzi, R.; Steri, A.; Stornelli, V.; Stracka, S.; Stringer, M.; Sulis, S.; Sung, A.; Suvorov, Y.; Szelc, A. M.; Tartaglia, R.; Taylor, A.; Taylor, J.; Tedesco, S.; Testera, G.; Thieme, K.; Thorpe, T. N.; Tonazzo, A.; Tricomi, A.; Unzhakov, E. V.; Vallivilayil John, T.; Van Uffelen, M.; Viant, T.; Viel, S.; Vogelaar, R. Bruce; Vossebeld, J.; Wada, M.; Walczak, M. B.; Wang, H.; Wang, Y.; Westerdale, S.; Williams, L.; Wingerter-Seez, I.; Wojaczyński, R.; Wojcik, Ma. M.; Wright, T.; Xie, Y.; Yang, C.; Zabihi, A.; Zakhary, P.; Zani, A.; Zichichi, A.; Zuzel, G.; Zykova, M. P. (2023-05-31)
    The Aria cryogenic distillation plant, located in Sardinia, Italy, is a key component of the DarkSide-20k experimental program for WIMP dark matter searches at the INFN Laboratori Nazionali del Gran Sasso, Italy. Aria is designed to purify the argon, extracted from underground wells in Colorado, USA, and used as the DarkSide-20k target material, to detector-grade quality. In this paper, we report the first measurement of argon isotopic separation by distillation with the 26m tall Aria prototype. We discuss the measurement of the operating parameters of the column and the observation of the simultaneous separation of the three stable argon isotopes: 36Ar, 38Ar, and 40Ar. We also provide a detailed comparison of the experimental results with commercial process simulation software. This measurement of isotopic separation of argon is a significant achievement for the project, building on the success of the initial demonstration of isotopic separation of nitrogen using the same equipment in 2019.
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    Measurement of the neutron beta-asymmetry parameter A(0) with ultracold neutrons
    Plaster, B.; Rios, R.; Back, H. O.; Bowles, T. J.; Broussard, L. J.; Carr, Rachel E.; Clayton, S.; Currie, S.; Filippone, B. W.; Garcia, A.; Geltenbort, P.; Hickerson, K. P.; Hoagland, J.; Hogan, G. E.; Hona, B.; Holley, A. T.; Ito, T. M.; Liu, C. Y.; Liu, J.; Makela, M.; Mammei, R. R.; Martin, J. W.; Melconian, D.; Mendenhall, M. P.; Morris, C. L.; Mortensen, R.; Pattie, R. W.; Galvan, A. P.; Pitt, M. L.; Ramsey, J. C.; Russell, R.; Saunders, A.; Schmid, R.; Seestrom, S. J.; Sjue, S.; Sondheim, W. E.; Tatar, E.; Tipton, B.; Vogelaar, R. Bruce; VornDick, B.; Wrede, C.; Xu, Y. P.; Yan, H.; Young, A. R.; Yuan, J.; Ucna Collaboration (American Physical Society, 2012-11-12)
    We present a detailed report of a measurement of the neutron beta-asymmetry parameter A(0), the parity-violating angular correlation between the neutron spin and the decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from a pulsed spallation solid deuterium source and polarized via transport through a 7-T magnetic field. The polarized UCN were then transported through an adiabatic-fast-passage spin-flipper field region, prior to storage in a cylindrical decay volume situated within a 1-T 2 x 2 pi solenoidal spectrometer. The asymmetry was extracted from measurements of the decay electrons in multiwire proportional chamber and plastic scintillator detector packages located on both ends of the spectrometer. From an analysis of data acquired during runs in 2008 and 2009, we report A(0) = -0.11966 +/- 0.00089(-0.00140)(+0.00123), from lambda = g(A)/g(V) = -1.27590 +/- 0.00239(-0.00377)(+0.00331). Complete details of the analysis are presented.
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    Performance of the Los Alamos National Laboratory spallation-driven solid-deuterium ultra-cold neutron source
    Saunders, A.; Makela, M.; Bagdasarova, Y.; Back, H. O.; Boissevain, J. G.; Broussard, L. J.; Bowles, T. J.; Carr, Rachel E.; Currie, S. A.; Filippone, B. W.; Garcia, A.; Geltenbort, P.; Hickerson, K. P.; Hill, R. E.; Hoagland, J.; Hoedl, S. A.; Holley, A. T.; Hogan, G.; Ito, T. M.; Lamoreaux, Steve; Liu, Chen-Yu; Liu, J.; Mammei, R. R.; Martin, J.; Melconian, D.; Mendenhall, M. P.; Morris, C. L.; Mortensen, R. N.; Pattie, R. W., Jr.; Pitt, M.; Plaster, B.; Ramsey, J.; Rios, R.; Sallaska, A. L.; Seestrom, S. J.; Sharapov, E. I.; Sjue, S.; Sondheim, W. E.; Teasdale, W.; Young, A. R.; VornDick, B.; Vogelaar, R. Bruce; Wang, Z.; Xu, Yanping (AIP Publishing, 2013-01)
    In this paper, we describe the performance of the Los Alamos spallation-driven solid-deuterium ultra-cold neutron (UCN) source. Measurements of the cold neutron flux, the very low energy neutron production rate, and the UCN rates and density at the exit from the biological shield are presented and compared to Monte Carlo predictions. The cold neutron rates compare well with predictions from the Monte Carlo code MCNPX and the UCN rates agree with our custom UCN Monte Carlo code. The source is shown to perform as modeled. The maximum delivered UCN density at the exit from the biological shield is 52(9) UCN/cc with a solid deuterium volume of similar to 1500 cm(3). (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4770063]
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    Search for low mass dark matter in DarkSide-50: the bayesian network approach
    Agnes, P.; Albuquerque, I. F. M.; Alexander, T.; Alton, A. K.; Ave, M.; Back, H. O.; Batignani, G.; Biery, K.; Bocci, V.; Bonivento, W. M.; Bottino, B.; Bussino, S.; Cadeddu, M.; Cadoni, M.; Calaprice, F.; Caminata, A.; Campos, M. D.; Canci, N.; Caravati, M.; Cargioli, N.; Cariello, M.; Carlini, M.; Cataudella, V.; Cavalcante, P.; Cavuoti, S.; Chashin, S.; Chepurnov, A.; Cicalò, C.; Covone, G.; D’Angelo, D.; Davini, S.; De Candia, A.; De Cecco, S.; De Filippis, G.; De Rosa, G.; Derbin, A. V.; Devoto, A.; D’Incecco, M.; Dionisi, C.; Dordei, F.; Downing, M.; D’Urso, D.; Fairbairn, M.; Fiorillo, G.; Franco, D.; Gabriele, F.; Galbiati, C.; Ghiano, C.; Giganti, C.; Giovanetti, G. K.; Goretti, A. M.; Grilli di Cortona, G.; Grobov, A.; Gromov, M.; Guan, M.; Gulino, M.; Hackett, B. R.; Herner, K.; Hessel, T.; Hosseini, B.; Hubaut, F.; Hungerford, E. V.; Ianni, An.; Ippolito, V.; Keeter, K.; Kendziora, C. L.; Kimura, M.; Kochanek, I.; Korablev, D.; Korga, G.; Kubankin, A.; Kuss, M.; La Commara, M.; Lai, M.; Li, X.; Lissia, M.; Longo, G.; Lychagina, O.; Machulin, I. N.; Mapelli, L. P.; Mari, S. M.; Maricic, J.; Messina, A.; Milincic, R.; Monroe, J.; Morrocchi, M.; Mougeot, X.; Muratova, V. N.; Musico, P.; Nozdrina, A. O.; Oleinik, A.; Ortica, F.; Pagani, L.; Pallavicini, M.; Pandola, L.; Pantic, E.; Paoloni, E.; Pelczar, K.; Pelliccia, N.; Piacentini, S.; Pocar, A.; Poehlmann, D. M.; Pordes, S.; Poudel, S. S.; Pralavorio, P.; Price, D. D.; Ragusa, F.; Razeti, M.; Razeto, A.; Renshaw, A. L.; Rescigno, M.; Rode, J.; Romani, A.; Sablone, D.; Samoylov, O.; Sandford, E.; Sands, W.; Sanfilippo, S.; Savarese, C.; Schlitzer, B.; Semenov, D. A.; Shchagin, A.; Sheshukov, A.; Skorokhvatov, M. D.; Smirnov, O.; Sotnikov, A.; Stracka, S.; Suvorov, Y.; Tartaglia, R.; Testera, G.; Tonazzo, A.; Unzhakov, E. V.; Vishneva, A.; Vogelaar, R. Bruce; Wada, M.; Wang, H.; Wang, Y.; Westerdale, S.; Wojcik, M. M.; Xiao, X.; Yang, C.; Zuzel, G. (2023-04-24)
    We present a novel approach for the search of dark matter in the DarkSide-50 experiment, relying on Bayesian Networks. This method incorporates the detector response model into the likelihood function, explicitly maintaining the connection with the quantity of interest. No assumptions about the linearity of the problem or the shape of the probability distribution functions are required, and there is no need to morph signal and background spectra as a function of nuisance parameters. By expressing the problem in terms of Bayesian Networks, we have developed an inference algorithm based on a Markov Chain Monte Carlo to calculate the posterior probability. A clever description of the detector response model in terms of parametric matrices allows us to study the impact of systematic variations of any parameter on the final results. Our approach not only provides the desired information on the parameter of interest, but also potential constraints on the response model. Our results are consistent with recent published analyses and further refine the parameters of the detector response model.