多中介体影响的超高能中微子衰减：IceCube中5D ${U(1)}_{L_\mu- L_\tau}$ 的暗示
Multiple-Mediator-Affected Ultra-High-Energy Neutrino Attenuation: Hints for 5D ${U(1)}_{L_μ- L_τ}$ in IceCube
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中文总结 AI 辅助
本文提出额外维 ${U(1)}_{L_\mu- L_\tau}$ 规范理论中的卡鲁扎-克莱因中介体塔增强中微子自相互作用，解释IceCube观测到的超高能中微子光谱软化现象。
中文摘要 AI 辅助
最近的IceCube观测表明，超高能中微子通量在数十TeV以上表现出非常软的光谱特性，这在标准宇宙射线-中微子联系中是不预期的。作为对这种行为的潜在解释，我们研究了额外维 ${U(1)}_{L_{\mu}-L_{\tau}}$ 规范理论中的中微子自相互作用，其中对称性破缺导致在紧致化四维中产生卡鲁扎-克莱因规范玻色子塔。这些多个规范玻色子可能增强天体物理中微子在C$\nu$B介质中传播时的衰减。与单中介体情形（例如由四维中破缺的 ${U(1)}_{L_\mu - L_\tau}$ 规范对称性产生的情形）不同，卡鲁扎-克莱因中介体塔的存在产生了多个紧密间隔的共振，其干涉在广泛的入射中微子能量范围内产生丰富的能量依赖的散射截面行为。除了$s$通道共振外，非共振的$t$通道和$u$通道贡献也变得重要。我们探索了天体物理中微子与C$\nu$B中中微子之间由这些新的多规范玻色子介导的重复共振散射可能在高能量下日益衰减前者的可能性，从而在考虑单一幂律的情况下解决其光谱特性软化的可能性。
英文摘要
Recent IceCube observations point to the ultra-high energy neutrino flux exhibiting a very soft spectral nature beyond tens of TeV, which is unexpected from the standard cosmic-ray neutrino connection. As a potential explanation for this behaviour, we investigate neutrino self-interactions in an extra-dimensional $ {U(1)}_{L_μ-L_τ} $ gauge theory, where symmetry breaking leads to a tower of Kaluza-Klein gauge bosons in compactified four dimensions. These multiple gauge bosons may enhance the attenuation of astrophysical neutrinos as they propagate in the C$ν$B medium. Unlike single-mediator scenarios, for example, which arise from broken $ {U(1)}_{L_μ- L_τ} $ gauge symmetries in four dimensions, the presence of a Kaluza-Klein tower of mediators produces multiple closely spaced resonances whose interference gives rise to a rich energy-dependent behaviour of the scattering cross-section over a vast range of incident neutrino energies. Alongside $s$-channel resonances, off-resonant $t$- and $u$-channel contributions also become important. We explore the possibility that repeated resonant scattering between astrophysical neutrinos and those in the C$ν$B, mediated by these new multiple gauge bosons may increasingly attenuate the former at higher energies, thereby addressing the possibility of softening its spectral nature within the consideration of a single power law.
发表机构
- Space sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège（列日大学空间科学、技术与天体物理研究（STAR）研究所）
- Department of Physics, Shiv Nadar University（希夫纳达尔大学物理系）
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