Improved EDELWEISS-III sensitivity for low-mass WIMPs using a profile likelihood approach-猫眼课题宝

DOI：

10.1140/epjc/s10052-016-4388-y

发表时间：

2016-07

期刊：

The European Physical Journal C

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

E. C. L. Hehn;E. Armengaud;Q. Arnaud;C. Augier;A. Benoit;L. Bergé;J. Billard;J. Blumer;T. Boissière;A. Broniatowski;P. Camus;A. Cazes;M. Chapellier;F. Charlieux;M. Jésus;L. Dumoulin;K. Eitel;N. Foerster;J. Gascon;A. Giuliani;M. Gros;G. Heuermann;Y. Jin;A. Juillard;C. Kéfélian;M. Kleifges;V. Kozlov;H. Kraus;V. Kudryavtsev;H. Le-Sueur;S. Marnieros;X. Navick;C. Nones;E. Olivieri;P. Pari;B. Paul;M. Piro;D. Poda;E. Queguiner;S. Rozov;V. Sanglard;B. Schmidt;S. Scorza;B. Siebenborn;D. Tcherniakhovski;L. Vagneron;M. Weber;E. Yakushev

本文报道了利用EDELWEISS-III实验在暗物质中寻找质量范围内的弱相互作用大质量粒子（WIMP）的研究结果。一个2D的配置文件的可能性分析进行的数据，从八个选定的探测器与最低的能量阈值，导致496公斤-天的组合基准曝光。外部背景和辐射，反冲和中子，以及探测器的固有背景进行建模，从感兴趣的区域外的数据，并在分析中的约束。基本数据选择和大多数背景模型与之前发布的基于提升决策树（BDT）的分析中使用的模型相同[1]。对于本文所述分析中应用的似然方法，较大的信号效率和预期背景的扣除导致较高的灵敏度，特别是对于探测的最低WIMP质量。没有发现统计上显著的信号，自旋无关的WIMP-核子散射截面的上限可以设置与假设检验的基础上的配置文件的似然检验统计。90% C. L.排除限制设置为WIMPs与这一点，这是一个改进的一个因素，7方面的BDT为基础的分析。对于WIMP质量以上的排除限制，发现与两种分析是在良好的协议。

We report on a dark matter search for a Weakly Interacting Massive Particle (WIMP) in the mass rangewith the EDELWEISS-III experiment. A 2D profile likelihood analysis is performed on data from eight selected detectors with the lowest energy thresholds leading to a combined fiducial exposure of 496 kg-days. External backgrounds from- and-radiation, recoils fromand neutrons as well as detector intrinsic backgrounds were modelled from data outside the region of interest and constrained in the analysis. The basic data selection and most of the background models are the same as those used in a previously published analysis based on boosted decision trees (BDT) [1]. For the likelihood approach applied in the analysis presented here, a larger signal efficiency and a subtraction of the expected background lead to a higher sensitivity, especially for the lowest WIMP masses probed. No statistically significant signal was found and upper limits on the spin-independent WIMP-nucleon scattering cross section can be set with a hypothesis test based on the profile likelihood test statistics. The 90 % C.L. exclusion limit set for WIMPs withis, which is an improvement of a factor of seven with respect to the BDT-based analysis. For WIMP masses abovethe exclusion limits found with both analyses are in good agreement.

Improved EDELWEISS-III sensitivity for low-mass WIMPs using a profile likelihood approach

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