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arXiv 0704.3934hep-ph
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未来Cosmic Ray探测器中的甚高能中微子信号

Signals of Very High Energy Neutralinos in Future Cosmic Ray Detectors

Sascha Bornhauser, Manuel Drees

摘要:

“自上而下”模型解释了通过非常大质量、寿命长的"$X$粒子“衰变观测到的超高能宇宙射线(UHECR; $E \gsim 5 \cdot 10^{19}$ eV)。如果质量接近TeV的超粒子存在,那么$X$衰变也会导致能量非常高的中性伴子的显著通量,被认为是(稳定或长寿的)最轻的超粒子。在一定的能量范围内,中微子会被地球吸收,但中性子仍然可以穿过地球。这些中性子原则上可以被探测到。我们计算检测率在计划的实验,如OWL和EUSO。对于比诺-像neutralinos,这已经被认为是以前,我们发现检测率低于1事件每兆吨的目标和年在所有情况下,往往率要小得多。相比之下,如果中性伴子是类希格西诺的,那么如果$X$粒子的质量接近其下限$\sim 10^{12}$ GeV,那么每年每兆吨可能会观察到十多个事件。

英文摘要:

``Top--down'' models explain the observation of ultra high energy cosmic rays (UHECR; $E \gsim 5 \cdot 10^{19}$ eV) through the decay of very massive, long--lived ``$X$ particles''. If superparticles with masses near a TeV exist, $X$ decays also lead to a significant flux of very energetic neutralinos, assumed to be the (stable or long--lived) lightest superparticles. There is a range of energies where neutrinos get absorbed in the Earth, but neutralinos can still traverse it. These neutralinos could in principle be detected. We calculate the detection rate in planned experiments such as OWL and EUSO. For bino--like neutralinos, which have been considered previously, we find detection rates below 1 event per Teraton of target and year in all cases; often the rates are much smaller. In contrast, if the neutralino is higgsino--like, more than ten events per year per Teraton might be observed, if the mass of the $X$ particle is near its lower bound of $\sim 10^{12}$ GeV.

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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