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arXiv 2004.06844astro-ph.HEhep-exhep-ph
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从高能宇宙中微子的奇奥共振看中微子衰变的新极限

New limits on neutrino decay from the Glashow resonance of high-energy cosmic neutrinos

Mauricio Bustamante

摘要:

发现中微子衰变将是物理学超越标准模型的有力证据。目前,中微子的寿命$τ$只有宽松的下限,为$τ/m \sim 10^{-3}$ s eV $^{-1}$或更低,其中$m$是未知的中微子质量。具有TeV-PeV能量的高能宇宙中微子,由于其宇宙尺度的基线,对衰变具有更高的灵敏度。为了利用它,我们采用了一种很有前途的方法,最近提出的,使用的marthow共振$\barν_e + e \to W$,触发的$\barν_e$的6.3 PeV,测试衰变只有少数检测到的事件。如果大部分的$ν_1$和$ν_2$在到达地球的途中衰变为$ν_3$,那么中微子望远镜中就不会发生共振,因为剩下的$ν_3$只有很小的电子味成分。我们扭转了这一局面,并利用最近首次检测到的冰立方中的一个新的共振候选人,把新的下限的寿命$ν_1$和$ν_2$。对于$ν_2$,我们的极限是目前最好的。对于$ν_1$,我们的极限接近目前的最佳值,并且随着第二次谐波共振的即将检测,将大大超过它。

英文摘要:

Discovering neutrino decay would be strong evidence of physics beyond the Standard Model. Presently, there are only lax lower limits on the lifetime $τ$ of neutrinos, of $τ/m \sim 10^{-3}$ s eV$^{-1}$ or worse, where $m$ is the unknown neutrino mass. High-energy cosmic neutrinos, with TeV-PeV energies, offer superior sensitivity to decay due to their cosmological-scale baselines. To tap into it, we employ a promising method, recently proposed, that uses the Glashow resonance $\barν_e + e \to W$, triggered by $\barν_e$ of 6.3 PeV, to test decay with only a handful of detected events. If most of the $ν_1$ and $ν_2$ decay into $ν_3$ en route to Earth, no Glashow resonance would occur in neutrino telescopes, because the remaining $ν_3$ have only a tiny electron-flavor content. We turn this around and use the recent first detection of a Glashow resonance candidate in IceCube to place new lower limits on the lifetimes of $ν_1$ and $ν_2$. For $ν_2$, our limit is the current best. For $ν_1$, our limit is close to the current best and, with the imminent detection of a second Glashow resonance, will vastly surpass it.

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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