论文标题
高能宇宙中微子的Glashow共振的中微子衰变的新限制
New limits on neutrino decay from the Glashow resonance of high-energy cosmic neutrinos
论文作者
论文摘要
发现中微子衰变将是超出标准模型以外的物理学的有力证据。目前，$τ/m \ sim 10^{ - 3} $ s ev $^{ - 1} $或更糟糕的中微子的寿命$τ$只有LAX下限$τ$。高能宇宙中微子具有TEV-PEV能量，由于其宇宙规模的基线，对衰变具有较高的敏感性。为了利用它，我们采用了一种有前途的方法，该方法使用了Glashow共振$ \barν_e + e \ to W $，由$ \barν_e$ of 6.3 PEV触发，仅少数检测到的事件来测试衰减。如果$ν_1$和$ν_2$衰减到$ν_3$的途中，则不会在中微子望远镜中发生Glashow共鸣，因为其余的$ν_3$只有很小的电子味含量。我们扭转局面，并使用最近对IceCube的Glashow共振候选者的首次检测，以在$ν_1$和$ν_2$的寿命上放置新的下限。对于$ν_2$，我们的极限是当前最佳的。对于$ν_1$，我们的极限接近当前最佳状态，并且在迫在眉睫的第二个Glashow共鸣时，我们的极限将大大超过它。
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.
