Neutron-antineutron oscillation and parity and CP symmetries
Neutron-antineutron oscillation and parity and CP symmetries
复制标题
中子-反中子振荡、宇称和 CP 对称性
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
A. Tureanu
中科院分区：
文献类型：
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作者：
K. Fujikawa;A. Tureanu
结果表明，中子-反中子振荡本身并不一定意味着CP违反在一个有效的本地洛伦兹不变描述的中子保留CPT，相反，最近的分析文献中。CP和重子数破坏项可以转化为CP守恒项，从而使CP破坏成为虚假的，例如在重子生成的分析中无法使用。它还表明，在一个$\Delta B=2$，洛伦兹和CPT不变的相互作用的中子反中子振荡可以发生只有当宇称被违反，无论CP属性;当宇称是保守的，它是普通的量子跃迁从中子到反中子发生。这些陈述是通过明确分析所有可能的组合与P，C和CP违反或其守恒证明。此外，在本模型中，如果用中微子代替中子，则P=奇数和P=偶数$\Delta B=2$相互作用的适当组合会产生右手中微子的CP保持质量项，从而加强了上述结论.
It is shown that the neutron-antineutron oscillation per se does not necessarily imply CP violation in an effective local Lorentz invariant description of the neutron which preserves CPT, contrary to a recent analysis in the literature. A CP- and baryon number-violating term can be transformed into a CP conserving one, thus rendering the CP violation spurious and unusable in the analysis of baryogenesis, for example. It is also shown that the neutron-antineutron oscillation in a $\Delta B=2$, Lorentz and CPT invariant interaction can occur only when parity is violated, irrespective of the CP properties; when parity is conserved, it is the ordinary quantum transition from neutron to antineutron which takes place. Those statements are proven by explicitly analyzing all the possible combinations with P, C and CP violation or their conservation. Moreover, a suitable combination of P=odd and P=even $\Delta B=2$ interactions in the present model is shown to give rise to the CP preserving mass term for the right-handed neutrino if one replaces the neutron by the neutrino, reinforcing the conclusion.