Revisiting ultrahigh-energy constraints on decaying superheavy dark matter
Revisiting ultrahigh-energy constraints on decaying superheavy dark matter
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DOI：
10.1103/physrevd.107.103013
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发表时间：
2023-02
影响因子：
5
通讯作者：
Saikat Das, Ph.D.;K. Murase;T. Fujii
中科院分区：
文献类型：
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作者：
Saikat Das, Ph.D.;K. Murase;T. Fujii
我们使用最新的超高能宇宙线(UHECR；$Egtrsim 10^{18}$eV)数据和Pierre Auger天文台测量的超高能(UHE)伽马射线通量上限，重新讨论了对衰变超重暗物质(VHDM)的限制。考虑到夸克、轻子和大质量玻色子的衰变，我们给出了质量在$10^{15}$GeV以下的VHDM寿命的最新极限。特别是，我们不仅考虑了UHECR光谱，而且考虑了它们的成分数据，这些数据有利于更重的核。由于VHDM衰变不产生UHECR核，这种联合分析改进了在$\less sim 10^{12}$GeV的极限。我们还表明，对于我们所考虑的所有标准模型末态，来自UHEγ射线上限的约束比来自宇宙射线的约束要严格得多。后者将我们对VHDM寿命的限制提高了两倍，暗物质质量为10^{12}$GeV。
We revisit constraints on decaying very heavy dark matter (VHDM) using the latest ultrahigh-energy cosmic-ray (UHECR; $E\gtrsim 10^{18}$ eV) data and ultrahigh-energy (UHE) $\gamma$-ray flux upper limits, measured by the Pierre Auger Observatory. We present updated limits on the VHDM lifetime ($\tau_\chi$) for masses up to $\sim10^{15}$~GeV, considering decay into quarks, leptons, and massive bosons. In particular, we consider not only the UHECR spectrum but their composition data that favors heavier nuclei. Such a combined analysis improves the limits at $\lesssim 10^{12}$ GeV because VHDM decay does not produce UHECR nuclei. We also show that the constraints from the UHE $\gamma$-ray upper limits are $\sim10$ more stringent than that obtained from cosmic rays, for all of the Standard Model final states we consider. The latter improves our limits to VHDM lifetime by a factor of two for dark matter mass $\gtrsim10^{12}$ GeV.