CP Violation in Physics

要了解我们宇宙的起源，了解CP破坏的起源是绝对必要的。为此，KEK建造了一台产生大量B介子的加速器。其目的是不检测小林Maskawa模型预测的大的CP破坏。SLAC也启动了类似的项目。该项目的目标之一是首先发现大的CP违规。理论小组的目标是通过预测哪里可以找到进一步的CP破坏来支持实验组。在2001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)。统计结果表明，在10^7中，B→J/ψKs衰变中不存在CP破坏的部分不超过1。这一结果与2001年7月在轻子高能光子相互作用国际会议上公布的类似SLAC结果是同时公布的。在2001年2月19日至12日期间在伊势斯举行的B物理和CP破坏国际研讨会上宣布了初步结果。这次会议是由这笔赠款赞助的。理论小组研究了在B→Kπ，π^π^-，π^π^0，K^K^-，K^K^0中观测CP破坏的可能性。该小组的另一个发现是首次发现了变味中性电流相互作用B→X_3l^L^-。BR(B→Kμ^μ^-)=(0.99^&lt；0.390.13；-0.32-0.15x 10^&lt；-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>.