Muon-induced background in the EDELWEISS dark matter search
The EDELWEISS collaboration, B. Schmidt, E. Armengaud, C. Augier, A. Benoit, L. Bergé, T. Bergmann, J. Blümer, G. Bres, A. Broniatowski, V. Brudanin, B. Censier… 展开作者
The EDELWEISS collaboration, B. Schmidt, E. Armengaud, C. Augier, A. Benoit, L. Bergé, T. Bergmann, J. Blümer, G. Bres, A. Broniatowski, V. Brudanin, B. Censier, M. Chapellier, F. Charlieux, S. Collin, P. Coulter, G. A. Cox, O. Crauste, J. Domange, L. Dumoulin, K. Eitel, D. Filosofov, N. Fourches, G. Garde, J. Gascon, G. Gerbier, M. Gros, L. Hehn, S. Henry, S. Hervé, G. Heuermann, A. Juillard, H. Kluck, V. Y. Kozlov, M. Kleifges, H. Kraus, V. A. Kudryavtsev, P. Loaiza, S. Marnieros, A. Menshikov, X. -F. Navick, H. Nieder, C. Nones, E. Olivieri, P. Pari, B. Paul, M. Robinson, H. Rodenas, S. Rozov, V. Sanglard, B. Siebenborn, D. Tcherniakhovski, A. S. Torrentó-Coello, L. Vagneron, R. J. Walker, M. Weber, E. Yakushev, X. Zhang
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21 pages, 16 figures, Accepted for publication in Astropart. Phys
A dedicated analysis of the muon-induced background in the EDELWEISS dark matter search has been performed on a data set acquired in 2009 and 2010. The total muon flux underground in the Laboratoire Souterrain de Modane (LSM) was measured to be $Φ_μ=(5.4\pm 0.2 ^{+0.5}_{-0.9})$\,muons/m$^2$/d. The modular design of the muon-veto system allows the reconstruction of the muon trajectory and hence the determination of the angular dependent muon flux in LSM. The results are in good agreement with both MC simulations and earlier measurements. Synchronization of the muon-veto system with the phonon and ionization signals of the Ge detector array allowed identification of muon-induced events. Rates for all muon-induced events $Γ^μ=(0.172 \pm 0.012)\, \rm{evts}/(\rm{kg \cdot d})$ and of WIMP-like events $Γ^{μ-n} = 0.008^{+0.005}_{-0.004}\, \rm{evts}/(\rm{kg \cdot d})$ were extracted. After vetoing, the remaining rate of accepted muon-induced neutrons in the EDELWEISS-II dark matter search was determined to be $Γ^{μ-n}_{\rm irred} < 6\cdot 10^{-4} \, \rm{evts}/(\rm{kg \cdot d})$ at 90%\,C.L. Based on these results, the muon-induced background expectation for an anticipated exposure of 3000\,\kgd\ for EDELWEISS-3 is $N^{μ-n}_{3000 kg\cdot d} < 0.6$ events.
Latest results of the direct dark matter search with the EDELWEISS-2 experiment
EDELWEISS-2是一个锗辐射热测量仪实验，位于Modane的地下实验室Alumatoire Souterrain（LSM，法国）。对于实验的第二阶段，该合作开发了具有改进的背景抑制的新的低温探测器（交错电极设计，物理快报。B681（2009）305）。在LSM的10个这些测辐射热计的连续操作连同一个积极的μ子否决屏蔽已经实现。最近发表了基于2009年采集的144 kg \dot d有效暴露量的第一批结果（Phys. Lett. B687（2010）29），此后获得的数据集增加了一倍。与EDELWEISS-1相比，已经发表的数据对应于约15的灵敏度提高。我们提出并讨论了最新的测辐射热计数据，包括识别μ子诱导的背景事件和μ子诱导的中子在LSM的特殊测量。
The Muonic Portal to Vector Dark Matter:connecting precision muon physics, cosmology, and colliders
University of Southampton（南安普顿大学）；Rutherford Appleton Laboratory（卢瑟福·阿普顿实验室）；Università della Calabria（卡拉布里亚大学）；INFN, Gruppo Collegato di Cosenza（意大利国家核物理研究所，科森扎协作组）；Khon Kaen University（孔敬大学）；Uppsala University（乌普萨拉大学）
The Migdal effect in Semiconductors for the Effective Field Theory of Dark Matter Direct Detection
Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院）；Walter Burke Institute for Theoretical Physics, California Institute of Technology（加州理工学院沃尔特·伯克理论物理研究所）；C.N. Yang Institute for Theoretical Physics, Stony Brook University（纽约州立大学石溪分校陈省身理论物理研究所）；Physics and Astronomy Department, Stony Brook University（纽约州立大学石溪分校物理与天文系）
