Wobbly Dark Matter Signals at Cherenkov Telescopes from Long-Lived Mediator Decays
Wobbly Dark Matter Signals at Cherenkov Telescopes from Long-Lived Mediator Decays
复制标题
切伦科夫望远镜因长寿命介体衰变而发出不稳定的暗物质信号
DOI：
10.1103/physrevlett.122.191103
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发表时间：
2019
影响因子：
8.6
通讯作者：
Shakya, Bibhushan
中科院分区：
文献类型：
--
作者：
Gori, Stefania;Profumo, Stefano;Shakya, Bibhushan
成像大气切伦科夫望远镜（IACT）对暗物质的搜索经常以“摆动模式”进行观测，即，同时从所述信号区域和相应的背景控制区域收集数据。这种观测策略可能会在暗物质湮灭为长寿命介质的情况下受到影响，这些介质可以在衰变之前穿越天体物理距离，产生IACT观测到的伽马射线。在这封信中，我们表明，这一挑战伴随着几个有趣的功能和机会：除了在背景控制区域的信号污染，伽马射线光谱随观察方向角的变化，通常表现出硬过剩在高能量。这样的功能代表了一个显着偏离规范的图片，并提供新的处理，以确定暗物质信号和提取潜在的暗物质参数。
Imaging Atmospheric Cherenkov telescope (IACT) searches for dark matter often perform observations in “wobble mode,” i.e., simultaneously collecting data from the signal region and from a corresponding background control region. This observation strategy is possibly compromised in scenarios where dark matter annihilates to long-lived mediators that can traverse astrophysical distances before decaying to produce the gamma rays observed by the IACTs. In this Letter, we show that this challenge comes with several interesting features and opportunities: in addition to signal contamination in the background control region, the gamma-ray spectrum changes with the observing direction angle and typically exhibits a hard excess at high energies. Such features represent a significant departure from the canonical picture and offer novel handles to identify a dark matter signal and to extract underlying dark matter parameters.