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arXiv 2302.03571astro-ph.HEhep-ph
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来自IceCube和μ子$g-2$的新规范玻色子信号

Signals of a New Gauge Boson from IceCube and Muon $g-2$

Dan Hooper, Joaquim Iguaz Juan, Pasquale D. Serpico

AI总结:

本研究探讨可解释μ子$g-2$反常的$U(1)_{L_μ - L_τ}$规范玻色子$Z'$对IceCube观测的高能中微子能谱的影响,发现其可自洽解释能谱的PeV凹陷特征,尤其适用于高红移中微子源的情形。

摘要:

与破缺的$U(1)_{L_μ - L_τ}$规范对称性相关的$Z'$玻色子,为长期存在的$g_μ-2$反常提供了一种简洁的解决方案,该反常已被费米实验室(Fermilab)的近期测量结果证实并进一步强化。本文重新探讨了这类$Z'$对IceCube实验所测量的高能天体物理中微子能谱的影响。观测发现该能谱在$E_ν \thicksim 0.2-1 \rm{PeV}$处呈现类凹陷特征,这一特征可能源于源本身的物理过程,但也可能是高能中微子与宇宙中微子背景发生共振散射的结果,该散射由质量约为$m_{Z'} \thicksim 10 \rm{MeV}$的$Z'$介导。本研究针对多种模型参数和源分布,计算了这类$Z'$对高能中微子能谱的影响。我们发现,对于能够解释$g_μ-2$反常的耦合取值,该模型可以自洽地产生与IceCube测量结果一致的能谱特征,尤其是在IceCube观测到的中微子主要来自高红移源的情况下。

英文摘要:

A $Z'$ boson associated with a broken $U(1)_{L_μ - L_τ}$ gauge symmetry offers an economical solution to the long-standing $g_μ-2$ anomaly, confirmed and strengthened by recent measurements at Fermilab. Here, we revisit the impact of such a $Z'$ on the spectrum of high-energy astrophysical neutrinos, as measured by the IceCube experiment. This spectrum has been observed to exhibit a dip-like feature at $E_ν \sim 0.2-1 \, {\rm PeV}$, which could plausibly arise from the physics of the sources themselves, but could also be the consequence of high-energy neutrinos resonantly scattering with the cosmic neutrino background, mediated by a $Z'$ with a mass on the order of $m_{Z'} \sim 10 \, {\rm MeV}$. In this study, we calculate the impact of such a $Z'$ on the high-energy neutrino spectrum for a variety of model parameters and source distributions. For couplings that can resolve the $g_μ-2$ anomaly, we find that this model could self-consistently produce a spectral feature that is consistent with IceCube's measurement, in particular if the neutrinos observed by IceCube predominantly originate from high-redshift sources.

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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