相对大θ_13的T2K指示和民主中微子混合斑图的自然扰动
The T2K Indication of Relatively Large theta_13 and a Natural Perturbation to the Democratic Neutrino Mixing Pattern
摘要：
T2 K合作组最近报道了一个显著的ν_μ-> ν_e振荡现象，这与三味中微子混合方案中相对较大的θ_{13}值相一致。我们指出，在没有或有CP破坏的情况下，通过对民主中微子混合斑图引入自然微扰，可以解释θ_{13}的这种结果。本文预测了θ_{13}与θ_{23}之间存在可检验的相关关系。我们还讨论了中微子混合的类Wolfenstein参数化，以及在电弱尺度下产生足够大θ_{13}的其它可能性。
英文摘要：
The T2K Collaboration has recently reported a remarkable indication of the ν_μ-> ν_e oscillation which is consistent with a relatively large value of θ_{13} in the three-flavor neutrino mixing scheme. We show that it is possible to account for such a result of θ_{13} by introducing a natural perturbation to the democratic neutrino mixing pattern, without or with CP violation. A testable correlation between θ_{13} and θ_{23} is predicted in this ansatz. We also discuss the Wolfenstein-like parametrization of neutrino mixing, and comment on other possibilities of generating sufficiently large θ_{13} at the electroweak scale.
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