Directional dark matter detection sensitivity of a two-phase liquid argon detector
Directional dark matter detection sensitivity of a two-phase liquid argon detector
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DOI：
10.1088/1475-7516/2019/01/014
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发表时间：
2017-04
影响因子：
6.4
通讯作者：
M. Cadeddu;M. Lissia;P. Agnes;G. Batignani;W. Bonivento;B. Bottino;M. Caravati;A. Cocco;G. Covone;A. Candia;S. Catalanotti;V. Cataudella;C. Cicalò;G. Filippis;G. Rosa;S. Davini;A. Devoto;C. Dionisi;D. Franco;C. Giganti;C. Galbiati;S. Giagu;M. Gulino;M. Kuss;L. Lista;G. Longo;A. Navrer-Agasson;M. Pallavicini;L. Pandola;E. Paoloni;E. Picciau;M. Razeti;M. Rescigno;Q. Riffard;B. Rossi;N. Rossi;G. Testera;P. Trinchese;A. Tonazzo;S. Walker;G. Fiorillo
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文献类型：
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作者：
M. Cadeddu;M. Lissia;P. Agnes;G. Batignani;W. Bonivento;B. Bottino;M. Caravati;A. Cocco;G. Covone;A. Candia;S. Catalanotti;V. Cataudella;C. Cicalò;G. Filippis;G. Rosa;S. Davini;A. Devoto;C. Dionisi;D. Franco;C. Giganti;C. Galbiati;S. Giagu;M. Gulino;M. Kuss;L. Lista;G. Longo;A. Navrer-Agasson;M. Pallavicini;L. Pandola;E. Paoloni;E. Picciau;M. Razeti;M. Rescigno;Q. Riffard;B. Rossi;N. Rossi;G. Testera;P. Trinchese;A. Tonazzo;S. Walker;G. Fiorillo
我们研究了大规模两相液态Ar探测器对暗物质信号方向性的敏感性。这项研究是在这样的假设下进行的，即在50keV以上的反冲能量下，人们可以(以一定的分辨率)确定反冲核的方向，而不存在头尾分辨，这是以往的研究提出的，即利用柱状复合对反冲核方向与电场的夹角的依赖性。本文研究了Gran Sasso实验室的探测器的微分相互作用反冲率随反冲方向角的变化，并确定了它的日变化和季节变化。使用基于似然比的方法，我们表明，对于完美的(400mrad)角分辨率，100(250)个事件足以在三个标准差水平上拒绝各向同性假设。对于100吨年的曝光量，这将对应于200GeV WIMP质量下约10−46 cm~2的自旋独立的WIMP-核子截面。本文的研究结果为实验确定两相液态Ar探测器的定向反冲效应提供了有力的理论依据。
We examine the sensitivity of a large scale two-phase liquid argon detector to the directionality of the dark matter signal. This study was performed under the assumption that, above 50 keV of recoil energy, one can determine (with some resolution) the direction of the recoil nucleus without head-tail discrimination, as suggested by past studies that proposed to exploit the dependence of columnar recombination on the angle between the recoil nucleus direction and the electric field. In this paper we study the differential interaction recoil rate as a function of the recoil direction angle with respect to the zenith for a detector located at the Laboratori Nazionali del Gran Sasso and we determine its diurnal and seasonal modulation. Using a likelihood-ratio based approach we show that, with the angular information alone, 100 (250) events are enough to reject the isotropic hypothesis at three standard deviation level, for a perfect (400 mrad) angular resolution. For an exposure of 100 tonne years this would correspond to a spin independent WIMP-nucleon cross section of about 10−46 cm2 at 200 GeV WIMP mass. The results presented in this paper provide strong motivation for the experimental determination of directional recoil effects in two-phase liquid argon detectors.