论文标题
隐形中微子衰减：第一个与第二振荡最大
Invisible neutrino decay : First vs second oscillation maximum
论文作者
论文摘要
我们研究了长基线实验T2HK，T2HKK和ESS $ν$ SB的物理潜力。我们考虑正常的质量顺序，并假定状态$ν_{3} $是不稳定的，在飞行过程中腐烂到无菌状态，并在中微子衰减寿命（$τ_3$）上获得约束。我们发现T2HK，T2HKK和ESS $ν$ SB对$ν_{3} $的衰减敏感，$τ_{3} {3}/m_ {3} \ leq 2.72 \ times10^{ - 11}}} 4.36 \ times10^{ - 11} $ s/eV和$τ_{3}/m_ {3} \ leq 2.43 \ times10^{ - 11} $ s/ev在3 $σ$ c.l.我们比较和对比三个实验的灵敏度，并特别研究了混合角$θ_{23} $所起的作用。可以看出，对于在第二振荡最大值附近磁通峰的实验，对$θ_{23} $的较差的敏感性会导致衰减寿命的限制较弱。虽然，T2HKK的一个检测器接近第二个振荡最大值，在第一个振荡最大值处有另一个检测器会导致对衰减的敏感性。此外，我们在T2HKK实验的两个基线之间找到了一种协同作用，这有助于在较高八分之一的$θ_{23} $中具有更好的灵敏度。我们讨论了存在衰减的八分之一灵敏度，并表明灵敏度有增强，这是由于生存概率$ p_ {μμμ} $的贡献而发生的，这对于第二个振荡最大值的实验更为明显。我们还获得了T2HK+ESS $ v $ SB和T2HKK+ESS $ Z $ sb的组合敏感性，为$τ_{3}/m_ {3} \ leq 4.36 \ times10^{ - 11} $ s/ev and $ s/ev and $ s/ev and $τ_{3}/m_ {3}/m_ {3}/m_ {3} $ {3} \ le s {3} \ le s { - {3} \ le s { - \ le s { - \ le s { - 在3 $σ$ c.l.
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.
