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arXiv 0704.1913hep-ph
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最小超对称标准模型和中性Higgs衰变中$χ^{+}_j χ^{-}_kH^{0}_l$相互作用的有效拉格朗日量

Effective Lagrangian for the $χ^{+}_j χ^{-}_kH^{0}_l$ interaction in the minimal supersymmetric standard model and neutral Higgs decays

Tarek Ibrahim

摘要:

我们扩展以前的分析超对称环校正的中性希格斯耦合,包括耦合$χ^{+}_j χ^{-}_kH^{0}_l$。该分析完成了先前的分析,其中在最小超对称标准模型内为$\barτ τH^{0}_l$、$\bar{b} b H^{0}_l$、$\bar{c} c H^{0}_l$和$\bar{t} t H^{0}_l$耦合计算了类似的校正。有效的单圈拉格朗日量,然后应用到中性希格斯衰变的计算。研究了中性Higgs衰变宽度对$χ^{+}_i χ^{-}_j$($i=1,2$ ; $j=1,2$)的超对称环修正的大小,发现超对称环修正在参数空间的显著区域中在$7\sim15%$的范围内.通过包括其他衰变通道$\bar{b} b$、$\bar{t} t$、$\barτ τ$、$\bar{c} c$和$χ^0_i χ^0_j$($i=1-4$ ; $j=1-4$)的环路校正,对$H^{0}_l\to χ^{+}_i χ^{-}_j$的分支比的校正可以达到高达40%。CP相的分支比的影响进行了研究。

英文摘要:

We extend previous analyses of the supersymmetric loop correction to the neutral Higgs couplings to include the coupling $χ^{+}_j χ^{-}_kH^{0}_l$. The analysis completes the previous analyses where similar corrections were computed for the $\barτ τH^{0}_l$, $\bar{b} b H^{0}_l$, $\bar{c} c H^{0}_l$ and for $\bar{t} t H^{0}_l$ couplings within the minimal supersymmetric standard model. The effective one loop Lagrangian is then applied to the computation of the neutral Higgs decays. The sizes of the supersymmetric loop corrections of the neutral Higgs decay widths into $χ^{+}_i χ^{-}_j$ ($i=1,2$; $j=1,2$) are investigated and the supersymmetric loop correction is found to be in the range of $7\sim15%$ in significant regions of the parameter space. By including the loop corrections of the other decay channels $\bar{b} b$, $\bar{t} t$, $\barτ τ$, $\bar{c} c$, and $χ^0_i χ^0_j$ ($i=1-4$; $j=1-4$), the corrections to branching ratios for $H^{0}_l\to χ^{+}_i χ^{-}_j$ can reach as high as 40%. The effects of CP phases on the branching ratio are also investigated.

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