| DOI | 10.1038/s41586-020-2177-0
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| Constraint on the matter-antimatter symmetry-violating phase in neutrino oscillations |
| Houben, Lothar1,2; Weissman, Haim3; Wolf, Sharon G.1,2; Rybtchinski, Boris3
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| 2020-03-01
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| 发表期刊 | NATURE
 |
| ISSN | 0028-0836
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| EISSN | 1476-4687
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| 出版年 | 2020
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| 卷号 | 580期号:7803页码:339-+ |
| 文章类型 | Article
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| 语种 | 英语
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| 国家 | Spain; Switzerland; USA; Canada; France; Scotland; Poland; Japan; Vietnam; England; Italy; Russia; Germany |
| 英文关键词 | The charge-conjugation and parity-reversal (CP) symmetry of fundamental particles is a symmetry between matter and antimatter. Violation of this CP symmetry was first observed in 1964(1), and CP violation in the weak interactions of quarks was soon established(2). Sakharov proposed(3) that CP violation is necessary to explain the observed imbalance of matter and antimatter abundance in the Universe. However, CP violation in quarks is too small to support this explanation. So far, CP violation has not been observed in non-quark elementary particle systems. It has been shown that CP violation in leptons could generate the matter-antimatter disparity through a process called leptogenesis(4). Leptonic mixing, which appears in the standard model'
s charged current interactions(5,6), provides a potential source of CP violation through a complex phase dCP, which is required by some theoretical models of leptogenesis(7-9). This CP violation can be measured in muon neutrino to electron neutrino oscillations and the corresponding antineutrino oscillations, which are experimentally accessible using accelerator-produced beams as established by the Tokai-to-Kamioka (T2K) and NOvA experiments(10,11). Until now, the value of dCP has not been substantially constrained by neutrino oscillation experiments. Here we report a measurement using long-baseline neutrino and antineutrino oscillations observed by the T2K experiment that shows a large increase in the neutrino oscillation probability, excluding values of dCP that result in a large increase in the observed antineutrino oscillation probability at three standard deviations (3 sigma). The 3 sigma confidence interval for delta(CP), which is cyclic and repeats every 2p, is [-3.41, -0.03] for the so-called normal mass ordering and [-2.54, -0.32] for the inverted mass ordering. Our results indicate CP violation in leptons and our method enables sensitive searches for matter-antimatter asymmetry in neutrino oscillations using accelerator-produced neutrino beams. Future measurements with larger datasets will test whether leptonic CP violation is larger than the CP violation in quarks.
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| 领域 | 地球科学
; 气候变化
; 资源环境
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| 收录类别 | SCI-E
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| WOS记录号 | WOS:000530151300023
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| WOS关键词 | HIGH-ENERGY
; SIMULATION
; AXIS
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| WOS类目 | Multidisciplinary Sciences
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| WOS研究方向 | Science & Technology - Other Topics
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/281342
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| 专题 | 地球科学
资源环境科学
气候变化
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| 作者单位 | 1.Weizmann Inst Sci, Dept Chem Res Support, Rehovot, Israel;
2.Weizmann Inst Sci, Dept Organ Chem, Rehovot, Israel;
3.Weizmann Inst Sci, Dept Organ Chem, Rehovot, Israel
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推荐引用方式
GB/T 7714 |
Houben, Lothar,Weissman, Haim,Wolf, Sharon G.,et al. Constraint on the matter-antimatter symmetry-violating phase in neutrino oscillations[J].
NATURE,2020,580(7803):339-+.
|
| APA |
Houben, Lothar,Weissman, Haim,Wolf, Sharon G.,&Rybtchinski, Boris.(2020).Constraint on the matter-antimatter symmetry-violating phase in neutrino oscillations.NATURE,580(7803),339-+.
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| MLA |
Houben, Lothar,et al."Constraint on the matter-antimatter symmetry-violating phase in neutrino oscillations".NATURE 580.7803(2020):339-+.
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