CP Violation in Physics

要了解宇宙的起源，我们绝对有必要了解CP破坏的起源。为此，KEK 建造了一个能够产生大量 B 介子的加速器。目标是检测 Kobayashi Maskawa 模型预测的大规模 CP 违规。 SLAC 也启动了类似的项目。该项目的目标之一是首先发现大型 CP 违规。理论小组的目标是通过预测哪里可以发现进一步的 CP 破坏来支持实验小组。在 2001 年物理年，Belle 宣布在 B 衰变中发现了大的 CP 破坏：sin 2φ_1 = 0.99 ± 0.14(stat) ± 0.06(syst)。从统计上看，这个结果意味着在 B → J/ψKs 衰变中，10^7 中只有不到 1 部分不存在 CP 破坏。这一结果与2001年7月高能轻子光子相互作用国际会议上的类似SLAC结果同时公布。2001年2月19日至12日在伊势举行的B物理和CP破坏国际研讨会上公布了初步结果。这次会议是由这笔资金赞助的。理论组研究了在 B → Kπ,π^ π^-, π^ π^0, K^ K^-, K^ K^0 中观察到 CP 破坏的可能性。该小组的另一个发现是首次观察到中性电流相互作用改变风味，B → X_3l^ l^-。 Br(B → Kμ^ μ^-) = (0.99^^< 0.39 0.13>__<-0.32 -0.15>) x 10^<-15>。

To understand the origin of our universe, it is absolutely necessary for us to understand the origin of CP violation. To this end KEK has built an accelerator which produces large number of B mesons. The goal was t detect the large CP violation predicted by the Kobayashi Maskawa model. Similar project was started at SLAC. One of the goal of this project was to discover the large CP violation first. The goal of the theory group was to support the experimental group by making predictions as to where further CP violation can be found.During the physical year of 2001, Belle announced the discovery of large CP violation in B decay : sin 2φ_1 = 0.99 ± 0.14(stat) ± 0.06(syst). Statistically, this result implies that there is less than 1 part in 10^7 that CP violation is absent in B → J/ψKs decay. This result was announced simultaneously with similar SLAC result at the international Conference in Lepton Photon Interactions at High Energies in July, 2001. A preliminary result was announced at International Workshop on B Physics and CP Violation, held at Ise during the period of Feb. 19-12, 2001. This conference was sponsored by this grant. The theory group studied possibilities of observing CP violation in B → Kπ,π^+π^-, π^+π^0, K^+K^-, K^+K^0. Another discovery made by this group is the first oservation of flavor changing neutral current interaction, B → X_3l^+l^-. Br(B → Kμ^+μ^-) = (0.99^^<+0.39 +0.13>__<-0.32 -0.15>) x 10^<-15>.