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arXiv 1109.3501astro-ph.IMhep-exphysics.ins-det
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利用电荷信号搜索DMTPC暗物质的背景抑制

Background Rejection in the DMTPC Dark Matter Search Using Charge Signals

J. P. Lopez, S. Ahlen, J. Battat, T. Caldwell, M. Chernicoff, C. Deaconu, D. Dujmic, A. Dushkin, W. Fedus, P. Fisher, F. Golub, S. Henderson, A. Inglis, A. Kabo… 展开作者

J. P. Lopez, S. Ahlen, J. Battat, T. Caldwell, M. Chernicoff, C. Deaconu, D. Dujmic, A. Dushkin, W. Fedus, P. Fisher, F. Golub, S. Henderson, A. Inglis, A. Kaboth, G. Kohse, L. Kirsch, R. Lanza, A. Lee, J. Monroe, H. Ouyang, T. Sahin, G. Sciolla, N. Skvorodnev, H. Tomita, H. Wellenstein, I. Wolfe, R. Yamamoto, H. Yegoryan

摘要:

暗物质时间投影室(DMTPC)合作正在开发用于测量WIMP-核子相互作用的低压气体TPC探测器。CCD相机的光学读出允许在暗物质风的方向上检测日常调制,而几个电荷读出通道允许测量额外的反冲特性。在这篇文章中,我们表明,除了电荷读出分析的CCD允许我们也获得一个南极极限90%的C. L。对于能量在40和200 keV之间的反冲$_{\mathrm{ee}}$,$e^-$抑制因子的上限为$5.6\times10^{-6}$。此外,要求电荷信号与CCD中的光之间的重合将CCD特定背景减少了两个数量级以上。

英文摘要:

The Dark Matter Time Projection Chamber (DMTPC) collaboration is developing low-pressure gas TPC detectors for measuring WIMP-nucleon interactions. Optical readout with CCD cameras allows for the detection for the daily modulation in the direction of the dark matter wind, while several charge readout channels allow for the measurement of additional recoil properties. In this article, we show that the addition of the charge readout analysis to the CCD allows us too obtain a statistics-limited 90% C.L. upper limit on the $e^-$ rejection factor of $5.6\times10^{-6}$ for recoils with energies between 40 and 200 keV$_{\mathrm{ee}}$. In addition, requiring coincidence between charge signals and light in the CCD reduces CCD-specific backgrounds by more than two orders of magnitude.

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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