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arXiv 0710.0340hep-ph
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具有明确CP破坏的MSSM中的双光子Higgs衰变

Di-photon Higgs decay in the MSSM with explicit CP violation

S. Hesselbach, S. Moretti, S. Munir, P. Poulose

摘要:

利用最轻中性希格斯玻色子玻色子的双光子衰变通道研究了具有明确CP破坏的最小超对称标准模型.在MSSM中,分析了有无轻粒子的情况下,通过高阶标量/赝标量混合以及树能级Higgs-sfermion-sfermion耦合进入的CP破坏效应.光阑对衰变过程H_1 → γ γ的衰变宽度和分支比(BR)有很大影响,而其它光粒子的影响很小。在MSSM参数空间的具有大的CP违反相位φ_mu ~ 90度的某些区域中,光阑可以使BR改变超过50%。

英文摘要:

The Minimal Supersymmetric Standard Model (MSSM) with explicit CP violation is studied with the help of the di-photon decay channel of the lightest neutral Higgs boson. Effects of CP violation, entering via the scalar/pseudo-scalar mixing at higher order as well as through the Higgs-sfermion-sfermion couplings at tree-level, are analyzed in the MSSM with and without light sparticles. A light stop may have a strong impact on the decay width and Branching Ratio (BR) of the decay process H_1 -> gamma gamma, whereas other light sparticles have only little influence. In some regions of the MSSM parameter space with large CP-violating phase phi_mu ~ 90 degrees a light stop can change the BR by more than 50%.

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