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arXiv 1504.08285hep-exhep-ph
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无中微子双β衰变的联合极限

A combined limit for neutrinoless double-beta decay

Pawel Guzowski

摘要:

寻找无中微子的双β衰变对于确定中微子的马约拉纳性质以及轻子数是否被破坏都很重要。在这项工作中,我们结合了五个独立的无中微子双β衰变实验:CUORICINO,EXO,GERDA,KamLAND-Zen和NEMO-3的公布的数据。由于这些实验使用不同的同位素源,因此它们之间的相对信号归一化取决于所使用的核矩阵元素(NME)计算。5种不同NME模型的马约拉纳中微子质量的综合极限范围为130-310 meV。根据NME模型,组合质量限制可以提供比单个实验高达25%的改进。

英文摘要:

The search for neutrinoless double-beta decay is important in determining the Majorana nature of the neutrino, and also in establishing if lepton number is violated. In this work, we combine the published data from five independent neutrinoless double-beta decay experiments: CUORICINO, EXO, GERDA, KamLAND-Zen and NEMO-3. As these experiments use different isotope sources, the relative signal normalisation between them depends on the Nuclear Matrix Element (NME) calculations used. The combined limits for the Majorana neutrino mass for 5 different NME models range from 130-310 meV. The combined mass limits can offer an improvement over the individual experiments of up to 25%, depending on the NME model.

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