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arXiv 1407.5293hep-ph
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近三重极大中微子混合的可测约束

Testable constraint on near-tribimaximal neutrino mixing

Biswajoy Brahmachari, Probir Roy

摘要:

一般的最低阶微扰厄米平方质量矩阵的轻子被认为是远离tribimalateral(TBM)的限制,其中选择一个弱味基与质量对角带电轻子。三个可测量的TBM偏差线性表示的扰动引起的无量纲系数出现在带电轻子和中微子味本征态。在假定不存在非自然抵消和带电轻子微扰对它们的味本征态的贡献很小的情况下,我们解析地得到了以下结果。在最低阶微扰中,与最大大气中微子混合的偏差和中微子振荡中CP破坏的量不可能都很大(即$12$ - $17 \% $),这对即将到来的强度前沿实验的验证提出了挑战。

英文摘要:

General lowest order perturbations to hermitian squared mass matrices of leptons are considered away from the tribimaximal (TBM) limit in which a weak flavor basis with mass diagonal charged leptons is chosen. The three measurable TBM deviants are expressed linearly in terms of perturbation induced dimensionless coefficients appearing in the charged lepton and neutrino flavor eigenstates. With unnatural cancellations assumed to be absent and the charged lepton perturbation contributions to their flavor eigenstates argued to be small, we analytically derive the following result. Within lowest order perturbations, a deviation from maximal atmospheric neutrino mixing and the amount of CP violation in neutrino oscillations cannot both be large (i.e. $12$-$17 \% $), posing the challenge of verification to forthcoming experiments at the intensity frontier.

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