arXiv 1002.14372010-02-07hep-ex

中微子质量和无中微子双β衰变：现状和展望

Neutrino masses and Neutrinoless Double Beta Decay: Status and expectations

Oliviero Cremonesi

备注：: Presented at the "European Strategy for Future Neutrino Physics" Workshop, CERN October 1-3 2009

摘要：

中微子物理学中最突出的两个问题是：中微子可能的马约拉纳性质和它们的绝对质量标度。直接测量中微子质量和无中微子双β衰变（0 nuDBD）是目前解决这一难题的方法。无中微子双β衰变破坏轻子数两个单位，只有当中微子是大质量的马约拉纳粒子时才能发生。因此，一个积极的观测结果必然意味着一个超越标准模型的新物理体系，提供关于中微子性质及其绝对质量尺度的基本信息。在观测到中微子振荡之后，根据目前对中微子质量和混合参数的了解，实际上可能存在在10-50 meV的中微子质量尺度上观测到0 nuDBDD的可能性。这是许多新提议项目面临的真正挑战。评述了无中微子双β衰变实验研究的现状和前景。最重要的参数有助于实验的灵敏度进行了概述。对核矩阵元计算也作了简要的讨论。补充测量，以评估绝对中微子质量尺度（宇宙学和单β衰变）也进行了讨论。

英文摘要：

Two most outstanding questions are puzzling the world of neutrino Physics: the possible Majorana nature of neutrinos and their absolute mass scale. Direct neutrino mass measurements and neutrinoless double beta decay (0nuDBD) are the present strategy to solve the puzzle. Neutrinoless double beta decay violates lepton number by two units and can occurr only if neutrinos are massive Majorana particles. A positive observation would therefore necessarily imply a new regime of physics beyond the standard model, providing fundamental information on the nature of the neutrinos and on their absolute mass scale. After the observation of neutrino oscillations and given the present knowledge of neutrino masses and mixing parameters, a possibility to observe 0nuDBDD at a neutrino mass scale in the range 10-50 meV could actually exist. This is a real challenge faced by a number of new proposed projects. Present status and future perpectives of neutrinoless double-beta decay experimental searches is reviewed. The most important parameters contributing to the experimental sensitivity are outlined. A short discussion on nuclear matrix element calculations is also given. Complementary measurements to assess the absolute neutrino mass scale (cosmology and single beta decays) are also discussed.

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