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arXiv 0804.1521hep-ph
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三双峰中微子混合和无中微子双β衰变

Tri-bimaximal neutrino mixing and neutrinoless double beta decay

M. Hirsch, S. Morisi, J. W. F. Valle

摘要:

我们提出了一个三双峰轻子混合方案,其中无中微子双β衰变率(bb 0 v)有一个下限,该下限与由当前数据确定的比值α = Dmsol/Dmatm以及表征太阳中微子子系统的未知Majorana CP相φ 12相关。对于特殊值phi 12 = pi/2(与CP符号相反的中微子),当Dmsol/Dmatm = 3/80时,bb 0 v速率在树级消失,仅允许在3 sigma。对于所有其他情况下的速率是非零的,并在当前和预计的实验灵敏度接近phi 12 =0。我们建议两个模型实现这个计划的A4 xZ 2和A4 xZ 4味对称性。

英文摘要:

We present a tri-bimaximal lepton mixing scheme where the neutrinoless double beta decay rate (bb0v) has a lower bound which correlates with the ratio alpha = Dmsol/Dmatm well determined by current data, as well as with the unknown Majorana CP phase phi12 characterizing the solar neutrino sub-system. For the special value phi12 = pi/2 (opposite CP-sign neutrinos) the bb0v rate vanishes at tree level when Dmsol/Dmatm = 3/80, only allowed at 3 sigma. For all other cases the rate is nonzero, and lies within current and projected experimental sensitivities close to phi12=0. We suggest two model realizations of this scheme in terms of an A4xZ2 and A4xZ4 flavour symmetries.

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