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Difference in direct charge-parity violation between charged and neutral B meson decays
Belle Collaboration
2008
发表期刊NATURE
卷号452期号:7185页码:332-335
通讯作者Chang, P (reprint author), Natl Taiwan Univ, Dept Phys, Taipei 106, Taiwan.
摘要Equal amounts of matter and antimatter are predicted to have been produced in the Big Bang, but our observable Universe is clearly matter- dominated. One of the prerequisites(1) for understanding this elimination of antimatter is the nonconservation of charge- parity ( CP) symmetry. So far, two types of CP violation have been observed in the neutral K meson ( K-0) and B meson ( B-0) systems: CP violation involving the mixing(2) between K-0 and its antiparticle (K) over bar (0) ( and likewise(3,4) for B-0 and (B) over bar (0)), and direct CP violation in the decay of each meson(5-8). The observed effects for both types of CP violation are substantially larger for the B-0 meson system. However, they are still consistent with the standard model of particle physics, which has a unique source(9) of CP violation that is known to be too small(10) to account for the matter-dominated Universe. Here we report that the direct CP violation in charged B-+/- --> K-+/- pi(0) decay is different from that in the neutral B-0 counterpart. The direct CP- violating decay rate asymmetry, A(K)+/- (pi 0) ( that is, the difference between the number of observed B- --> K- pi(0) event versus B+ --> K+ pi(0) events, normalized to the sum of these events) is measured to be about +7%, with an uncertainty that is reduced by a factor of 1.7 from a previous measurement(7). However, the asymmetry A(K+/-) p(-/+) for B-0 --> K- pi(+) versus B-0 --> K+ pi(-) is at the -10% level(7,8). Although it is susceptible to strong interaction effects that need further clarification, this large deviation in direct CP violation between charged and neutral B meson decays could be an indication of new sources of CP violation - which would help to explain the dominance of matter in the Universe.
关键词DIRECT CP VIOLATION ASYMMETRIES BELLE
学科领域Science & Technology - Other Topics
DOI10.1038/nature06827
收录类别SCI
语种英语
WOS类目Multidisciplinary Sciences
WOS记录号WOS:000254117400042
引用统计
被引频次:95[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/212843
专题实验物理中心
作者单位中国科学院高能物理研究所
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Belle Collaboration. Difference in direct charge-parity violation between charged and neutral B meson decays[J]. NATURE,2008,452(7185):332-335.
APA Belle Collaboration.(2008).Difference in direct charge-parity violation between charged and neutral B meson decays.NATURE,452(7185),332-335.
MLA Belle Collaboration."Difference in direct charge-parity violation between charged and neutral B meson decays".NATURE 452.7185(2008):332-335.
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