Constraining Neutrino Mass from Neutrinoless Double Beta Decay
Constraining Neutrino Mass from Neutrinoless Double Beta Decay
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DOI：
10.1103/physrevd.88.091301
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发表时间：
2013-04
影响因子：
5
通讯作者：
P. P. Dev-P.;S. Goswami;M. Mitra;W. Rodejohann
中科院分区：
文献类型：
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作者：
P. P. Dev-P.;S. Goswami;M. Mitra;W. Rodejohann
我们重新分析了76 Ge中无中微子双β衰变（0）的观测结果与EXO-200和KamLAND-Zen对136 Xe半衰期的新限制的兼容性。包括最近的计算的核矩阵元素（NME），我们表明，虽然在76锗的索赔仍然是兼容的个别限制从136 <$N的一些NME计算，它是不一致的KamLAND-Zen+EXO-200的组合限制，但一个NME。在对普朗克轻中微子质量之和施加最严格的上限后，我们发现正则轻中微子的贡献不能满足0的签名或饱和的电流限制，不管NME的不确定性。然而，包括重中微子的贡献，自然产生的TeV尺度左右对称模型，可以饱和的电流限制为0。在II型跷跷板框架中，这对最轻的中微子质量施加了一个下限。根据质量层次，我们得到这个限制是在0.07 - 4毫电子伏的范围内的右手（RH）规范玻色子和RH中微子的质量相关的对撞机搜索的典型选择。使用0的界限，我们还得到相关的限制在RH部门，互补的LHC。
We re-analyze the compatibility of the claimed observation of neutrinoless double beta decay (0 ) in 76 Ge with the new limits on the half-life of 136 Xe from EXO-200 and KamLAND-Zen. Including recent calculations of the nuclear matrix elements (NMEs), we show that while the claim in 76 Ge is still compatible with the individual limits from 136 Xe for a few NME calculations, it is inconsistent with the KamLAND-Zen+EXO-200 combined limit for all but one NME. After imposing the most stringent upper limit on the sum of light neutrino masses from Planck, we nd that the canonical light neutrino contribution cannot satisfy the claimed 0 signature or saturate the current limit, irrespective of the NME uncertainties. However, inclusion of the heavy neutrino contributions, arising naturally in TeV-scale Left-Right symmetric models, can saturate the current limit of 0 . In a type-II seesaw framework, this imposes a lower limit on the lightest neutrino mass. Depending on the mass hierarchy, we obtain this limit to be in the range of 0.07 - 4 meV for a typical choice of the right-handed (RH) gauge boson and RH neutrino masses relevant for their collider searches. Using the 0 bounds, we also derive correlated constraints in the RH sector, complimentary to those from the LHC.