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arXiv 1107.4549hep-phhep-ex
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三重极大轻子混合的推广

An extension of tribimaximal lepton mixing

Y. H. Ahn, Hai-Yang Cheng, Sechul Oh

摘要:

Harrison、Perkins和Scott提出了导致三重极大混合$U_{\rm TBM}$的简单带电轻子和中微子质量矩阵。我们认为在这项工作中的质量矩阵的扩展,使轻子混合矩阵成为$U_{\rm PMNS}=V_L^{\ell\dagger}U_{\rm TBM}W$,其中$V_L^\ell$是一个酉矩阵对角化的带电轻子质量矩阵和$W$措施的中微子混合矩阵的偏差从双峰形式。因此,对$U_{\rm TBM}$的修正来自带电轻子和中微子扇区。在我们之前的工作中,假设了带电轻子混合矩阵$V_L^\ell$的类Qin-Ma参数化$V_{\rm QM}$,其中{ \it CP}-奇相位近似最大,我们研究了两种不同情况下的唯象意义:$V_L^\ell=V_{\rm QM}^\dagger$和$V_L^\ell=V_{\rm QM}$ .我们发现,后者是更可取的,虽然这两种情况是一致的数据范围内的$3σ$。在这两种情况下,预测的反应堆中微子混合角$θ_{13}$与最近的T2 K和MINOS数据是一致的。由Jarlskog不变量$J_{\rm CP}$表征的轻子{ \it CP}破坏一般为$10^{-2}$阶。

英文摘要:

Harrison, Perkins and Scott have proposed simple charged lepton and neutrino mass matrices that lead to the tribimaximal mixing $U_{\rm TBM}$. We consider in this work an extension of the mass matrices so that the leptonic mixing matrix becomes $U_{\rm PMNS}=V_L^{\ell\dagger}U_{\rm TBM}W$, where $V_L^\ell$ is a unitary matrix needed to diagonalize the charged lepton mass matrix and $W$ measures the deviation of the neutrino mixing matrix from the bimaximal form. Hence, corrections to $U_{\rm TBM}$ arise from both charged lepton and neutrino sectors. Following our previous work to assume a Qin-Ma-like parametrization $V_{\rm QM}$ for the charged lepton mixing matrix $V_L^\ell$ in which the {\it CP}-odd phase is approximately maximal, we study the phenomenological implications in two different scenarios: $V_L^\ell=V_{\rm QM}^\dagger$ and $V_L^\ell=V_{\rm QM}$. We find that the latter is more preferable, though both scenarios are consistent with the data within $3σ$ ranges. The predicted reactor neutrino mixing angle $θ_{13}$ in both scenarios is consistent with the recent T2K and MINOS data. The leptonic {\it CP} violation characterized by the Jarlskog invariant $J_{\rm CP}$ is generally of order $10^{-2}$.

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