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arXiv 1104.1952hep-ph
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无中子双β衰变和跷跷板机制

Neutrinoless double-beta decay and seesaw mechanism

Samoil M. Bilenky, Amand Faessler, Walter Potzel, Fedor Simkovic

摘要:

中微子质量产生的标准跷跷板机制是基于轻子数在大尺度(~ 10 exp(+15)GeV)下被破坏的假设,由此得出无中微子双β衰变由马约拉纳中微子质量机制控制。在这个概念下,我们推导出了在不同的核矩阵元下,实验上感兴趣的原子核的无中微子双β衰变的半寿期的允许范围。本文简要地讨论了无中微子双β衰变核矩阵元的计算结果。我们认为,如果中微子双β衰变将在未来的实验中观察到的有效马约拉纳质量在倒置的质量等级区域的敏感性,与测得的半衰期的比较推导出的范围将使我们能够探测标准的跷跷板机制假设未来的宇宙学数据将建立中微子质量的总和约为0.2 eV。

英文摘要:

From the standard seesaw mechanism of neutrino mass generation, which is based on the assumption that the lepton number is violated at a large (~10exp(+15) GeV) scale, follows that the neutrinoless double-beta decay is ruled by the Majorana neutrino mass mechanism. Within this notion, for the inverted neutrino-mass hierarchy we derive allowed ranges of half-lives of the neutrinoless double-beta decay for nuclei of experimental interest with different sets of nuclear matrix elements. The present-day results of the calculation of the neutrinoless double-beta decay nuclear matrix elements are briefly discussed. We argue that if neutrinoless double-beta decay will be observed in future experiments sensitive to the effective Majorana mass in the inverted mass hierarchy region, a comparison of the derived ranges with measured half-lives will allow us to probe the standard seesaw mechanism assuming that future cosmological data will establish the sum of neutrino masses to be about 0.2 eV.

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