arXiv 1805.073422018-05-18hep-phastro-ph.HE

具有R宇称破坏的高尺度超对称性中的引力子衰变

Gravitino Decay in High Scale Supersymmetry with R-parity Violation

Emilian Dudas, Tony Gherghetta, Kunio Kaneta, Yann Mambrini, Keith A. Olive

备注：: 27 pages, 4 figures
发表信息：: Phys. Rev. D 98, 015030 (2018)
DOI：: 10.1103/PhysRevD.98.015030

摘要：

考虑了在EeV尺度引力子为暗物质的高尺度超对称模型中，由于引入双线性$μ^\prime L H_u$超势项而导致的R宇称破坏效应.尽管这种耦合的典型现象学限制（例如由于轻子数破坏和重子不对称性的保持）在超对称质谱被假定为重时被放松（超过$3 \times 10^{13}$ GeV的暴胀尺度），引力子必须足够长的寿命，以解释观测到的暗物质密度，导致对$μ^\prime \lesssim 20$ GeV的相对较强的束缚。引力子纵分量的主要衰变通道是$Z ν, W^\pm l^\mp$和$hν$。为了避免在冰立方中产生过多的中微子信号，我们将$μ'$的极限提高到了$μ' \lesssim 50$ keV。当束缚饱和时，我们发现存在一个潜在的可探测的单色中微子流，能量为EeV。

英文摘要：

We consider the effects of R-parity violation due to the inclusion of a bilinear $μ^\prime L H_u$ superpotential term in high scale supersymmetric models with an EeV scale gravitino as dark matter. Although the typical phenomenological limits on this coupling (e.g. due to lepton number violation and the preservation of the baryon asymmetry) are relaxed when the supersymmetric mass spectrum is assumed to be heavy (in excess of the inflationary scale of $3 \times 10^{13}$ GeV), the requirement that the gravitino be sufficiently long-lived so as to account for the observed dark matter density, leads to a relatively strong bound on $μ^\prime \lesssim 20$ GeV. The dominant decay channels for the longitudinal component of the gravitino are $Z ν, W^\pm l^\mp$, and $hν$. To avoid an excess neutrino signal in IceCube, our limit on $μ'$ is then strengthened to $μ' \lesssim 50$ keV. When the bound is saturated, we find that there is a potentially detectable flux of mono-chromatic neutrinos with EeV energies.

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