摘要
在一代Technicolor(TCI)和带有一个无质量的标量二重态(TCⅡ)模型下,计算荷电的哥尔斯通粒子对衰变B_c→D_sγ的贡献,并把它们同标准模型的计算相比较,发现哥尔斯通粒子对电磁企鹅图的贡献很大(TCI下),在TCⅡ下贡献较小;而对弱湮没图的贡献可以忽略不计,还对同位旋三重态粒子π+p的质量进行了约束。预言将来在LHC上能对不同模型下的分支比Br(Bc→Dsγ)的差异进行研究,进而对不同的模型进行检验。
We calulate the psedo-Goldstone-bosons (PGB)contributions to thedecay Bc →Ds γ in one generation technicolor model (TCI) and the technicolor model with massless doublet (TCⅡ),and compare with thecontributions estimated in the standard model. We find that thecontributions of PGBs in the TCⅠ tothe electri-magnetic penguin dirgram are large, whereas those of the TCⅡ are small. However, thecontributions to the weak annihilation diagrams can be neglected. Itis expected that the difference of the branching ratio Br (Bc→Dsγ)in various models can be studied at LHC in near future, and will be animportant test to different models.
出处
《高能物理与核物理》
CSCD
北大核心
1997年第5期413-424,共12页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
关键词
辐射衰变
哥尔斯通粒子
电磁企鹅图
弱湮没
radiative decay, pseudo-Goldstone0bosons, technicolor nodel,electro-magnetic penguin, weak annihilation mechanism.