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arxiv: 2511.13629 · v2 · submitted 2025-11-17 · ✦ hep-ex · hep-ph

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Sensitivity to low-mass WIMPs with an improved liquid argon ionization response model within the DarkSide programme

F. Acerbi , P. Adhikari , P. Agnes , I. Ahmad , S. Albergo , I. F. Albuquerque , T. Alexander , A. K. Alton
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P. Amaudruz M. Angiolilli E. Aprile M. Atzori Corona D. J. Auty M. Ave I. C. Avetisov O. Azzolini H. O. Back Z. Balmforth A. I. Barrado Olmedo P. Barrillon G. Batignani S. Bharat P. Bhowmick S. Blua V. Bocci W. Bonivento B. Bottino M. G. Boulay T. Braun A. Buchowicz S. Bussino J. Busto M. Cadeddu R. Calabrese V. Camillo A. Caminata N. Canci M. Caravati M. C\'ardenas-Montes N. Cargioli M. Carlini P. Cavalcante S. Cebrian S. Chashin A. Chepurnov S. Choudhary L. Cifarelli B. Cleveland Y. Coadou I. Coarasa V. Cocco E. Conde Vilda L. Consiglio A. F. V. Cortez B. S. Costa M. Czubak S. D'Auria M. D. Da Rocha Rolo A. Dainty G. Darbo S. Davini R. de Asmundis S. De Cecco M. De Napoli G. Dellacasa A. V. Derbin L. Di Noto P. Di Stefano L. K. Dias D. D\'iaz Mairena C. Dionisi G. Dolganov F. Dordei V. Dronik A. Elersich T. Erjavec N. Fearon M. Fern\'andez D\'iaz L. Ferro A. Ficorella G. Fiorillo D. Fleming P. Franchini D. Franco H. Frandini Gatti E. Frolov F. Gabriele D. Gahan C. Galbiati G. Gali\'nski G. Gallina M. Garbini P. Garcia Abia A. Gawdzik G. K. Giovanetti V. Goicoechea Casanueva A. Gola L. Grandi G. Grauso G. Grilli di Cortona A. Grobov M. Gromov J. Guerrero C\'anovas M. Gulino B. R. Hackett A. L. Hallin M. Haranczyk B. Harrop T. Hessel C. Hidalgo J. Hollingham J. Hu F. Hubaut D. Huff T. Hugues E. V. Hungerford An. Ianni V. Ippolito A. Jamil C. Jillings R. Keloth N. Kemmerich M. Kimura A. Klenin K. Kondo G. Korga L. Kotsiopoulou S. Koulosousas A. Kubankin P. Kunz\'e M. Kuss M. Ku\'zniak M. Kuzwa M. La Commara M. Lai E. Le Guirriec E. Leason A. Leoni L. Lidey J. Lipp M. Lissia L. Luzzi O. Lychagina O. Macfadyen I. Machts I. N. Machulin S. Manecki I. Manthos L. Mapelli A. Marasciulli S. M. Mari C. Mariani J. Maricic M. Martinez C. J. Martoff G. Matteucci K. Mavrokoridis A. B. McDonald S. Merzi A. Messina R. Milincic S. Minutoli A. Mitra J. Monroe M. Morrocchi A. Morsy V. N. Muratova M. Murra P. Musico R. Nania M. Nessi G. Nieradka K. Nikolopoulos E. Nikoloudaki I. Nikulin J. Nowak K. Olchanski A. Oleinik V. Oleynikov P. Organtini A. Ortiz de Sol\'orzano A. Padmanabhan M. Pallavicini L. Pandola E. Pantic E. Paoloni D. Papi B. Park G. Pastuszak G. Paternoster R. Pavarani A. Peck K. Pelczar R. Perez V. Pesudo S. Piacentini N. Pino G. Plante A. Pocar S. Pordes P. Pralavorio E. Preosti D. Price M. Pronesti S. Puglia M. Queiroga Bazetto F. Raffaelli F. Ragusa Y. Ramachers A. Ramirez S. Ravinthiran M. Razeti A. L. Renshaw A. Repond M. Rescigno S. Resconi F. Retiere L. P. Rignanese A. Ritchie-Yates A. Rivetti A. Roberts C. Roberts G. Rogers L. Romero M. Rossi D. Rudik J. Runge M. A. Sabia D. Sablone P. Salomone O. Samoylov S. Sanfilippo D. Santone R. Santorelli E. M. Santos I. Sargeant M. L. Sarsa C. Savarese E. Scapparone F. G. Schuckman D. A. Semenov C. Seoane M. Sestu V. Shalamova S. Sharma Poudel A. Sheshukov M. Simeone P. Skensved M. D. Skorokhvatov O. Smirnov T. Smirnova B. Smith F. Spadoni M. Spangenberg A. Steri V. Stornelli S. Stracka A. Sung C. Sunny Y. Suvorov A. M. Szelc O. Taborda R. Tartaglia A. Taylor J. Taylor G. Testera K. Thieme A. Thompson S. Torres-Lara A. Tricomi S. Tullio E. V. Unzhakov M. Van Uffelen P. Ventura G. Vera D\'iaz S. Viel A. Vishneva R. B. Vogelaar J. Vossebeld B. Vyas M. Wada M. Walczak Y. Wang S. Westerdale L. Williams M. M. Wojcik M. Wojcik C. Yang J. Yin A. Zabihi P. Zakhary A. Zani Y. Zhang T. Zhu A. Zichichi G. Zuzel M. P. Zykova
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classification ✦ hep-ex hep-ph
keywords ionizationanalysisargondarkdarksideliquidlow-massmatter
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Dark matter detection experiments using liquid argon rely on a precise characterization of the ionization response to nuclear recoils, especially in the keV energy range relevant for light dark matter interactions. In this work, we present a comprehensive analysis that combines new measurements from the ReD setup, part of the DarkSide experimental program, with calibration data from DarkSide-50, as well as results from the ARIS and SCENE experiments. These combined datasets enable improved constraints on atomic screening effects in the modeling of the ionization response of liquid argon to nuclear recoils. The analysis is performed within the Thomas-Imel recombination framework adopted in previous DarkSide studies, and is here further constrained by the inclusion of ReD data, which allow the screening function to be determined from calibration measurements. By including the updated ionization model into the DarkSide-50 analysis framework, we obtain stronger exclusion limits on low-mass WIMP interactions, setting new world-leading constraints in the 1-3 GeV/c^2 WIMP mass range. Finally, we recast the sensitivity projections for the upcoming DarkSide-20k detector, demonstrating a significantly enhanced discovery potential for low-mass dark matter candidates.

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