标题： 辐射对称性破缺和广义GMSB模型中的${b \to s γ}$衰变 显示英文标题

标题： Radiative symmetry breaking and the ${b \to s γ}$ decay in generalized GMSB models

摘要： 我们研究了一类广义的规范介导超对称破缺（GMSB）模型。 我们找到了所有满足规范耦合在大统一尺度之前保持微扰性的GMSB模型中最小超对称标准模型（MSSM）的参数和完整粒子谱。 我们详细描述了用于通过考虑（一环）辐射效应来预测MSSM中所有未测量参数的算法。 我们还计算了分支比$BR(b \to s \gamma)$，并发现它总是大于标准模型的预测。 然而，我们发现除了某些特殊情况，例如轻量级带电希格斯玻色子，或者较小的超对称破缺尺度和负的$\mu$-参数外，分支比通常仍处于当前实验界限之内。 显示英文摘要

摘要： We study a class of generalized models of gauge mediated supersymmetry breaking (GMSB). We find the parameters and the full particle spectrum of the minimal supersymmetric standard model (MSSM) for all GMSB models with messenger multiplicities that satisfy the perturbativity of the gauge couplings up to the GUT scale. We give a detailed description of the algorithm that has been used to predict all the unmeasured parameters of the MSSM by taking (one-loop) radiative effects into account. We also calculate the branching ratio $BR(b \to s \gamma)$ and find that it always turns out to be larger than the standard model prediction. However, we find that the branching ratio typically remains within the current experimental bounds, except for some special cases with a light charged Higgs boson, or a small supersymmetry breaking scale and a negative $\mu$-parameter.