gb→tH^-的超对称QCD单圈修正和非退耦效应  

gb→tH^- One Loop SUSY-QCD Corrections and Nondecoupling Effects

作　　者：万陵德[1] 鲁公儒[1] 高广平[2] 

机构地区：[1]河南师范大学物理与信息工程学院,新乡453002 [2]中国科学院理论物理所,100080

出　　处：《高能物理与核物理》2003年第3期189-195,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 10 175 0 17)~~

摘　　要：在最小超对称标准模型的框架内计算了gb→tH- 过程产生截面的单圈超对称QCD修正 .结果发现 :若胶子质量和超对称软破缺参数 μ或At,Ab 同量级且趋于很大 ,就会出现超对称QCD的非退耦效应 .大的tanβ值可以提高非退耦的贡献 ,因此大tanβ情况下 ,较大的修正结果可能在Tevatron和LHC上观测到 .In this paper one loop SUSY QCD radiative correction to gb→tH - cross section is calculated in the context of Minimal Supersymmetric Standard Model. We found that non decoupling effects of SUSY QCD will occur if the gluino mass and the SUSY soft breaking parameter μ or A t, A b are at the same order and get large. The non decoupling contribution can be enhanced by large tan β and therefore large corrections to the hadronic production rates at the Tevatron and LHC are expected in the large tan β limit. The fundamental reason for such non decoupling behavior is found to be some couplings in the loops being proportional to SUSY mass parameters.

关 键 词：最小超对称标准模型 软破缺 超对称QCD 非退耦效应 gb→tH^-过程 单圈修正 量子色动力学 

分 类 号：O572.33[理学—粒子物理与原子核物理]