Pulse-shape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data.
Pulse-shape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data.
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DOI：
10.1140/epjc/s10052-021-09514-w
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
DEAP Collaboration
中科院分区：
文献类型：
--
作者：
Adhikari P;Ajaj R;Alpízar-Venegas M;Amaudruz PA;Auty DJ;Batygov M;Beltran B;Benmansour H;Bina CE;Bonatt J;Bonivento W;Boulay MG;Broerman B;Bueno JF;Burghardt PM;Butcher A;Cadeddu M;Cai B;Cárdenas-Montes M;Cavuoti S;Chen M;Chen Y;Cleveland BT;Corning JM;Cranshaw D;Daugherty S;DelGobbo P;Dering K;DiGioseffo J;Di Stefano P;Doria L;Duncan FA;Dunford M;Ellingwood E;Erlandson A;Farahani SS;Fatemighomi N;Fiorillo G;Florian S;Flower T;Ford RJ;Gagnon R;Gallacher D;García Abia P;Garg S;Giampa P;Goeldi D;Golovko V;Gorel P;Graham K;Grant DR;Grobov A;Hallin AL;Hamstra M;Harvey PJ;Hearns C;Hugues T;Ilyasov A;Joy A;Jigmeddorj B;Jillings CJ;Kamaev O;Kaur G;Kemp A;Kochanek I;Kuźniak M;Lai M;Langrock S;Lehnert B;Leonhardt A;Levashko N;Li X;Lidgard J;Lindner T;Lissia M;Lock J;Longo G;Machulin I;McDonald AB;McElroy T;McGinn T;McLaughlin JB;Mehdiyev R;Mielnichuk C;Monroe J;Nadeau P;Nantais C;Ng C;Noble AJ;O'Dwyer E;Oliviéro G;Ouellet C;Pal S;Pasuthip P;Peeters SJM;Perry M;Pesudo V;Picciau E;Piro MC;Pollmann TR;Rand ET;Rethmeier C;Retière F;Rodríguez-García I;Roszkowski L;Ruhland JB;Sánchez-García E;Santorelli R;Sinclair D;Skensved P;Smith B;Smith NJT;Sonley T;Soukup J;Stainforth R;Stone C;Strickland V;Stringer M;Sur B;Tang J;Vázquez-Jáuregui E;Viel S;Walding J;Waqar M;Ward M;Westerdale S;Willis J;Zuñiga-Reyes A;DEAP Collaboration
DEAP-3600 探测器搜索 3.3 吨液氩目标上散射的暗物质粒子的闪烁信号。最大的背景来自 β 衰变，并使用脉冲形状辨别 (PSD) 进行抑制。我们使用两种类型的 PSD 估计器：提示分数，它考虑事件峰值周围的窄时间窗口和宽时间窗口中闪烁信号的分数，以及对数似然比，它将观察到的光子到达时间与信号和背景模型进行比较。我们还使用两种算法来确定在给定时间检测到的光子数量：（1）简单地将每个 PMT 脉冲的电荷除以平均单光电子电荷，以及（2）基于闪烁脉冲形状和光探测器中后脉冲的模型，考虑在给定时间检测到一定数量光子的概率的似然分析。如果光子检测时间不受探测器效应的影响，则提示分数的性能与对数似然比 PSD 算法大致相同。我们使用闪烁光子携带的信息作为检测到它们的时间的函数的模型来解释这一结果。
The DEAP-3600 detector searches for the scintillation signal from dark matter particles scattering on a 3.3 tonne liquid argon target. The largest background comes from beta decays and is suppressed using pulse-shape discrimination (PSD). We use two types of PSD estimator: the prompt-fraction, which considers the fraction of the scintillation signal in a narrow and a wide time window around the event peak, and the log-likelihood-ratio, which compares the observed photon arrival times to a signal and a background model. We furthermore use two algorithms to determine the number of photons detected at a given time: (1) simply dividing the charge of each PMT pulse by the mean single-photoelectron charge, and (2) a likelihood analysis that considers the probability to detect a certain number of photons at a given time, based on a model for the scintillation pulse shape and for afterpulsing in the light detectors. The prompt-fraction performs approximately as well as the log-likelihood-ratio PSD algorithm if the photon detection times are not biased by detector effects. We explain this result using a model for the information carried by scintillation photons as a function of the time when they are detected.
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DOI：
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发表时间：
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影响因子：
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作者：
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