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Neutrino mass ordering and reflection symmetry breaking
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If the neutrino mass spectrum turns out to be m3＜m1＜m2,it may be relabeled as m1＜m2＜m3 such that all the masses of fundamental fermions with the same electrical charges are in order.In this case the columns of the 3×3 lepton flavor mixing matrix U should be reordered accordingly,and the resulting pattern U' may involve one or two large mixing angles in the standard parametrization or its variations.Since the Majorana neutrino mass matrix remains unchanged in such a mass relabeling,a possible μ-τ reflection symmetry is respected in this connection and its breaking effects are model-independently constrained at the 3σ level by using current experimental data.
neutrinosflavor symmetrymass hierarchy
Zhi-zhong Xing、Jing-yu Zhu
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Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China
School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China
Center for High Energy Physics,Peking University,Beijing 100080,China
Supported by National Natural Science Foundation of ChinaSupported by National Natural Science Foundation of China
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