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arXiv 0911.2117hep-ph
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介子对无中子双β衰变的贡献

Pionic Contribution to Neutrinoless Double Beta Decay

J. D. Vergados, Amand Faessler, H. Toki

摘要:

众所周知,无中微子双衰变在解决中微子性质问题上起着至关重要的作用,而这一点无法从中微子振荡数据中提取出来。特别是,它有望解决中微子质量的绝对尺度,并确定中微子是否是马约拉纳粒子,即它们与自己的反粒子重合。为了从数据中提取平均中微子质量,必须能够估计所有可能的高质量中间粒子的贡献。后者出现在标准模型的几乎所有扩展中,原则上可以与通常的质量项区分开来,如果可以获得来自各种目标的数据的话。然而,首先必须能够可靠地计算相应的核矩阵元素。这种计算是非常困难的,因为有效的过渡算子是非常短的范围。对于这样的运营商的过程,如介子的贡献,这通常是微不足道的,原来是占主导地位的。我们在非相对论性夸克模型中研究了π介子和核子的这种效应。

英文摘要:

It is well known that neutrinoless double decay is going to play a crucial role in settling the neutrino properties, which cannot be extracted from the neutrino oscillation data. It is, in particular, expected to settle the absolute scale of neutrino mass and determine whether the neutrinos are Majorana particles, i.e. they coincide with their own antiparticles. In order to extract the average neutrino mass from the data one must be able to estimate the contribution all possible high mass intermediate particles. The latter, which occur in practically all extensions of the standard model, can, in principle, be differentiated from the usual mass term, if data from various targets are available. One, however, must first be able reliably calculate the corresponding nuclear matrix elements. Such calculations are extremely difficult since the effective transition operators are very short ranged. For such operators processes like pionic contributions, which are usually negligible, turn out to be dominant. We study such an effect in a non relativistic quark model for the pion and the nucleon.

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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