arXiv 1802.076902018-02hep-ph

根据长基线中微子实验的最新结果强热$SO(10)$激发的稀薄成因

Strong thermal $SO(10)$-inspired leptogenesis in the light of recent results from long-baseline neutrino experiments

Marco Chianese, Pasquale Di Bari

备注：: 21 pages, 5 figures. v2: matching version to be published in JHEP. arXiv admin note: text overlap with arXiv:1705.01935
DOI：: 10.1007/JHEP05(2018)073

摘要：

我们面对最近的实验结果中微子混合参数的要求，从强热$SO(10)$启发leptogenesis，其中的不对称性产生的下一个最轻的右手中微子$N_2$独立的初始条件。最新的全球分析支持$\sinδ< 0$和$ \sim 95\%$ C.L.的正常排序，两者之间存在良好的一致性。另一方面，更严格的实验下限的大气混合角开始角落强热$SO(10)$启发leptogenesis。这一快速的实验进展的验证和鼓励，我们得到了一个精确的测定平面$δ$与$θ_{23}$的允许区域。我们确认，对于基准情况$α_2 \equiv m_{D2} / m_{\rm charm}= 5 \, $，其中$m_{D2}$是中间中微子狄拉克质量设置的$N_2$质量，和初始预先存在的不对称性$N_{B-L}^{\rm p, i} = 10^{-3}$，大部分的解决方案位于第一个八分圆。虽然大多数解决方案都在$95\%$ C.L.之外找到。在实验区，仍然有一个大的允许分数，不需要太微调的马约拉纳相的选择，使得无中微子双β衰变有效中微子质量允许范围仍然是$m_{ee}\simeq [10,30]\,{\rm meV}$。我们还展示了如何约束依赖于$N_{B-L}^{\rm p, i}$和$α_2$。特别是，我们表明，目前的最佳拟合，（$θ_{23},δ)\simeq (47^{\circ}, -130^{\circ})$，可以重现$N_{B-L}^{\rm p, i} = 10^{-3}$和$α_2 = 6$。最近在$SO(10)$启发的模型中的几个现实拟合中获得了$α_2$的如此大的值。最后，我们还得到了当前中微子数据将$N_{B-L}^{\rm p, i} \gtrsim 0.1$排除为$α_2 \lesssim 4.7$的结论.

英文摘要：

We confront recent experimental results on neutrino mixing parameters with the requirements from strong thermal $SO(10)$-inspired leptogenesis, where the asymmetry is produced from next-to-lightest right-handed neutrinos $N_2$ independently of the initial conditions. There is a nice agreement with latest global analyses supporting $\sinδ< 0$ and normal ordering at $ \sim 95\%$ C.L. On the other hand, the more stringent experimental lower bound on the atmospheric mixing angle starts to corner strong thermal $SO(10)$-inspired leptogenesis. Prompted and encouraged by this rapid experimental advance, we obtain a precise determination of the allowed region in the plane $δ$ versus $θ_{23}$. We confirm that for the benchmark case $α_2 \equiv m_{D2} / m_{\rm charm}= 5 \, $, where $m_{D2}$ is the intermediate neutrino Dirac mass setting the $N_2$ mass, and initial pre-existing asymmetry $N_{B-L}^{\rm p, i} = 10^{-3}$, the bulk of solutions lies in the first octant. Though most of the solutions are found outside the $95\%$ C.L. experimental region, there is still a big allowed fraction that does not require a too fine-tuned choice of the Majorana phases so that the neutrinoless double beta decay effective neutrino mass allowed range is still $m_{ee}\simeq [10,30]\,{\rm meV}$. We also show how the constraints depend on $N_{B-L}^{\rm p, i}$ and $α_2$. In particular, we show that the current best fit, ($θ_{23},δ)\simeq (47^{\circ}, -130^{\circ})$, can be reproduced for $N_{B-L}^{\rm p, i} = 10^{-3}$ and $α_2 = 6$. Such large values for $α_2$ have been recently obtained in a few realistic fits within $SO(10)$-inspired models. Finally, we also obtain that current neutrino data rule out $N_{B-L}^{\rm p, i} \gtrsim 0.1$ for $α_2 \lesssim 4.7$.

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摘要：

英文摘要：

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