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arXiv 1109.0702astro-ph.CO
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CRESST-II暗物质搜寻的730公斤日的结果

Results from 730 kg days of the CRESST-II Dark Matter Search

G. Angloher, M. Bauer, I. Bavykina, A. Bento, C. Bucci, C. Ciemniak, G. Deuter, F. von Feilitzsch, D. Hauff, P. Huff, C. Isaila, J. Jochum, M. Kiefer, M. Kimmer… 展开作者

G. Angloher, M. Bauer, I. Bavykina, A. Bento, C. Bucci, C. Ciemniak, G. Deuter, F. von Feilitzsch, D. Hauff, P. Huff, C. Isaila, J. Jochum, M. Kiefer, M. Kimmerle, J. -C. Lanfranchi, F. Petricca, S. Pfister, W. Potzel, F. Pröbst, F. Reindl, S. Roth, K. Rottler, C. Sailer, K. Schäffner, J. Schmaler, S. Scholl, W. Seidel, M. von Sivers, L. Stodolsky, C. Strandhagen, R. Strauß, A. Tanzke, I. Usherov, S. Wawoczny, M. Willers, A. Zöller

摘要:

CRESST-II低温暗物质搜索旨在通过CaWO $_4$晶体中原子核的弹性散射来探测WIMP,2011年完成了730千克天的数据采集。我们提出了八个探测器模块收集的数据,每个都有一个双通道读出,一个声子信号和其他巧合产生的闪烁光。前者提供了由相互作用沉积的能量的精确测量,并且闪烁光与沉积能量的比率可以用于区分不同类型的相互作用粒子,从而区分可能的信号事件与主导背景。67个事件被发现在接受区的低能核反冲形式的WIMP信号将被预期。我们估计这一观测的背景贡献来自四个来源:1)来自e/γ带的“泄漏”,2)来自α粒子带的“泄漏”,3)中子和4)来自Po-210衰变的Pb-206反冲。使用极大似然分析,我们发现,在一个高的统计意义,这些来源本身是不足以解释的数据。由于散射的相对轻的WIMP的信号可以解释这种差异,我们确定相关的WIMP参数。

英文摘要:

The CRESST-II cryogenic Dark Matter search, aiming at detection of WIMPs via elastic scattering off nuclei in CaWO$_4$ crystals, completed 730 kg days of data taking in 2011. We present the data collected with eight detector modules, each with a two-channel readout; one for a phonon signal and the other for coincidently produced scintillation light. The former provides a precise measure of the energy deposited by an interaction, and the ratio of scintillation light to deposited energy can be used to discriminate different types of interacting particles and thus to distinguish possible signal events from the dominant backgrounds. Sixty-seven events are found in the acceptance region where a WIMP signal in the form of low energy nuclear recoils would be expected. We estimate background contributions to this observation from four sources: 1) "leakage" from the e/γ-band 2) "leakage" from the α-particle band 3) neutrons and 4) Pb-206 recoils from Po-210 decay. Using a maximum likelihood analysis, we find, at a high statistical significance, that these sources alone are not sufficient to explain the data. The addition of a signal due to scattering of relatively light WIMPs could account for this discrepancy, and we determine the associated WIMP parameters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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