Z′模型下B_d→φK_S衰变过程CP不对称的研究  

Study on B_d→φK_S decays in a flavor changing Z′ model

作　　者：王帅伟[1] 党兰银[2] 

机构地区：[1]南阳师范学院物理与电子工程学院,河南南阳473061 [2]南阳市一中物理教研组,河南南阳473000

出　　处：《南阳师范学院学报》2008年第9期29-32,共4页Journal of Nanyang Normal University

基　　金：南阳师范学院高层次人才科研启动经费资助

摘　　要：在Z′模型下,考虑来自于中性规范玻色子Z′产生的树图阶味改变中性流的贡献,对Bd→φKS衰变过程的CP不对称进行了研究.经过计算发现:当假定LζL=ζRL=LζR=RζR=ζ和LζL=ζRL=ζ且LζR=RζR=0时,我们分别得到了0.0052<ζ<0.0074,0.0083<ζ<0.0104,0.0113<ζ<0.0127和0.0097<ζ<0.0184,0.0226<ζ<0.0255,这个结果和模型对参数的限制是一致的.In this paper, we study the time-dependent CP asymmetry SζKs of the Bd→φKs decay in a Z′ model associated with flavor changing neutral currents at the tree level. We obtain the results of 0. 0052 〈 ζ 〈 0. 0074, 0. 0083 〈ζ 〈0. 0104, 0. 0113 〈 ζ 〈 0. 0127 and 0. 0097 〈 ζ 〈 0. 0184, 0. 0226 〈 ζ 〈 0. 0255 for the two decay processes when setting ζLL = ζRL = ζLR = ζRR = ζ and ζLL = ζRL = ζ, ζLR = ζRR = 0, respectively. These results are consistent with the constraints and assumptions on the model parameters in some references.

关 键 词：Z′模型 QCD因子化 味改变中性流 

分 类 号：O572.33[理学—粒子物理与原子核物理]