在ILC上用γγ→Z过程检验非对易时空标度(英文)  

Probing Noncommutative Space-Time Scale Usingγγ→Z at ILC

作　　者：何小刚[1] 李学潜[2] 

机构地区：[1]台湾大学物理系和理论科学中心,台北南开大学物理系天津300071 [2]南开大学物理系,天津300071

出　　处：《高能物理与核物理》2007年第9期844-848,共5页High Energy Physics and Nuclear Physics

摘　　要：讨论关于在ILC用gamma gamma到Z过程检验非对易时空能标(原文发在hep-ph/0604115).在通常时空量子场论中,由杨氏定理可知一个自旋为1的粒子不可能衰变为两个光子.但在非对易时空中此过程是允许的.因此这个过程能作为检验非对易时空的工具.ILC的光子对撞模式能实现这个过程.如果总亮度能达到500fb^(-1),我们证明对Gamma(z to gamma gamma)宽度的测量精度将比现有限制(<5.2×10^(-5)GeV)好3—4个数量级.对非对易时空能标的检测可高达几个TeV.In this talk we report our work on testing Noncommutative Space-Time Scale Using γγ→ Z at ILC. In ordinary space-time theory, decay of a spin-1 particle into two photons is strictly forbidden due to the Yang＇s Theorem. With noncommutative space-time this process can occur. This process thus provides an important probe for noncommutative space-time. The γγ collision mode at the ILC provides an ideal place to carry out such a study. Assuming an integrated luminosity of 500fb- 1, we show that the constraint which can be achieved on Γ（Z → γγ） is three to four orders of magnitude better than the current bound of 5.2× 10^-5GeV. The noncommutative scale can be probed up to a few TeVs.

关 键 词：非对易时空 杨氏定理 光子对撞机 

分 类 号：O572.23[理学—粒子物理与原子核物理]