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arXiv 1606.06221hep-phastro-ph.COhep-ex
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无中子双$β$衰变和低尺度细生

Neutrinoless double $β$ decay and low scale leptogenesis

Marco Drewes, Shintaro Eijima

摘要:

用质量在GeV范围内的右手中微子对标准模型进行扩展,可以同时用跷跷板机制解释观测到的中微子质量和用轻子生成解释宇宙的重子不对称性。先前有人声称,成功的重子生成的要求意味着在这种情况下,无中微子双$β$衰变的速率总是小于仅从轻中微子交换的标准预测。相比之下,我们发现,该过程的速率也可以提高由于重中微子交换的主要贡献。在参数空间的一小部分,它甚至超过了目前的实验极限,而重中微子的性质是符合所有其他的实验约束和观察到的重子不对称再现。这意味着,无中微子双$β$衰变实验已经开始排除不受任何其他实验约束的部分轻子生成参数空间,并且在不久的将来可能会观察到轻子数破坏,这是宇宙中重子物质起源的原因。

英文摘要:

The extension of the Standard Model by right handed neutrinos with masses in the GeV range can simultaneously explain the observed neutrino masses via the seesaw mechanism and the baryon asymmetry of the universe via leptogenesis. It has previously been claimed that the requirement for successful baryogenesis implies that the rate of neutrinoless double $β$ decay in this scenario is always smaller than the standard prediction from light neutrino exchange alone. In contrast, we find that the rate for this process can also be enhanced due to a dominant contribution from heavy neutrino exchange. In a small part of the parameter space it even exceeds the current experimental limit, while the properties of the heavy neutrinos are consistent with all other experimental constraints and the observed baryon asymmetry is reproduced. This implies that neutrinoless double $β$ decay experiments have already started to rule out part of the leptogenesis parameter space that is not constrained by any other experiment, and the lepton number violation that is responsible for the origin of baryonic matter in the universe may be observed in the near future.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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