arXiv 2012.049582020-12-09hep-ph

看不见的中微子衰变：第一个与第二个振荡最大值

Invisible neutrino decay : First vs second oscillation maximum

Kaustav Chakraborty, Debajyoti Dutta, Srubabati Goswami, Dipyaman Pramanik

备注：: 12 figure, 4 tables
DOI：: 10.1007/JHEP05(2021)091

摘要：

我们在看不见的中微子衰变背景下研究了长基线实验T2 HK、T2 HKK和ESS $ν$ SB的物理势。我们考虑正常的质量排序，并假设状态$ν_{3}$作为不稳定的，衰减到无菌状态在飞行过程中，并获得中微子衰变寿命（$τ_3$）的限制。在3 $σ$ C. L时，T2 HK、T2 HKK和ESS $ν$ SB对$ν_{3}$的衰减速率分别为$τ_{3}/m_{3} \leq 2.72\times10^{-11}$ s/eV、$τ_{3}/m_{3} \leq 4.36\times10^{-11}$ s/eV和$τ_{3}/m_{3} \leq 2.43\times10^{-11}$ s/eV。我们比较和对比了三个实验的灵敏度，并特别研究了混合角$θ_{23}$所起的作用。可以看出，对于通量峰值接近第二振荡最大值的实验，对$θ_{23}$的较差灵敏度导致对衰变寿命的较弱约束。尽管T2 HKK具有接近第二振荡最大值的一个检测器，但是在第一振荡最大值处具有另一检测器导致对衰减的优越灵敏度。此外，我们发现T2 HKK实验的两个基线之间的协同作用，这有助于在较高的八分圆中对$θ_{23}$提供更好的灵敏度。我们讨论的八分圆的灵敏度存在的衰减，并表明，有一个增强的灵敏度，这是由于从生存概率$P_{μμ}$的贡献，这是更明显的实验在第二个振荡最大值。在3 $σ$ C. L.条件下，T2 HK +ESS $ν$ SB和T2 HKK +ESS $ν$ SB的联合灵敏度分别为$τ_{3}/m_{3} \leq 4.36\times10^{-11}$ s/eV和$τ_{3}/m_{3} \leq 5.53\times10^{-11}$ s/eV。

英文摘要：

We study the physics potential of the long-baseline experiments T2HK, T2HKK and ESS$ν$SB in the context of invisible neutrino decay. We consider normal mass ordering and assume that the state $ν_{3}$ as unstable, decaying into sterile states during the flight and obtain constraints on the neutrino decay lifetime ($τ_3$). We find that T2HK, T2HKK and ESS$ν$SB are sensitive to the decay-rate of $ν_{3}$ for $τ_{3}/m_{3} \leq 2.72\times10^{-11}$s/eV, $τ_{3}/m_{3} \leq 4.36\times10^{-11}$s/eV and $τ_{3}/m_{3} \leq 2.43\times10^{-11}$s/eV respectively at 3$σ$ C.L. We compare and contrast the sensitivities of the three experiments and specially investigate the role played by the mixing angle $θ_{23}$. It is seen that for experiments with flux peak near the second oscillation maxima, the poorer sensitivity to $θ_{23}$ results in weaker constraints on the decay lifetime. Although, T2HKK has one detector close to the second oscillation maxima, having another detector at the first oscillation maxima results in superior sensitivity to decay. In addition, we find a synergy between the two baselines of the T2HKK experiment which helps in giving a better sensitivity for $θ_{23}$ in the higher octant. We discuss the octant sensitivity in presence of decay and show that there is an enhancement in sensitivity which occurs due to the contribution from the survival probability $P_{μμ}$ which is more pronounced for the experiments at the second oscillation maxima. We also obtain the combined sensitivity of T2HK+ESS$ν$SB and T2HKK+ESS$ν$SB as $τ_{3}/m_{3} \leq 4.36\times10^{-11}$s/eV and $τ_{3}/m_{3} \leq 5.53\times10^{-11}$s/eV respectively at 3$σ$ C.L.

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。

摘要：

英文摘要：

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