arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.13557hep-ph
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暗辐射存在下的中微子底

The neutrino-floor in the presence of dark radation

Marco Nikolic, Suchita Kulkarni, Josef Pradler

摘要:

在这项工作中,我们分析的最终灵敏度的暗物质直接探测实验,“中微子地板”,在存在的异常源的暗辐射的形式SM或半无菌中微子。这种通量分量被认为是由暗物质衰变产生的。由于暗辐射可能会模仿暗物质信号,我们进行我们的分析的基础上的似然统计,允许测试信号和背景之间的兼容性。我们表明,氙为基础的实验的中微子地板可能会解除存在额外的暗辐射。此外,我们还探讨了暗物质衰变产生的中微子暗辐射在直接探测实验中的可测性。鉴于以前的中微子实验的界限,我们发现,氙为基础的暗物质搜索将无法探测新的区域的暗物质祖质量和寿命参数空间时,衰变产物是SM中微子。反过来,如果衰变发生在与重子相互作用增强的第四种中微子物质上,DR可以构成直接检测实验中的主要背景或可重复的信号。

英文摘要:

In this work we analyse the ultimate sensitivity of dark matter direct detection experiments, the "neutrino-floor", in the presence of anomalous sources of dark radiation in form of SM or semi-sterile neutrinos. This flux-component is assumed to be produced from dark matter decay. Since dark radiation may mimic dark matter signals, we perform our analysis based on likelihood statistics that allows to test the distinguishability between signals and backgrounds. We show that the neutrino floor for xenon-based experiments may be lifted in the presence of extra dark radiation. In addition, we explore the testability of neutrino dark radiation from dark matter decay in direct detection experiments. Given the previous bounds from neutrino experiments, we find that xenon-based dark matter searches will not be able to probe new regions of the dark matter progenitor mass and lifetime parameter space when the decay products are SM neutrinos. In turn, if the decay instead happens to a fourth neutrino species with enhanced interactions to baryons, DR can either constitute the dominant background or a discoverable signal in direct detection experiments.

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