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arXiv 0710.4923hep-ph
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具有CP破坏的SUSY中双光子Higgs衰变

Di-photon Higgs Decay in SUSY with CP Violation

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

摘要:

在最小超对称标准模型(MSSM)中,具有明确CP破坏的物理Higgs粒子是CP混合态。这些希格斯粒子的衰变可以用来研究MSSM的CP性质。在本工作中,我们考虑最轻的中性希格斯玻色子的双光子通道为此目的。与早期的标量/赝标量混合效应的研究相比,我们的分析还研究了由于Higgs-sfermion-sfermion耦合以及混合的影响。我们发现,光停止可能对衰变过程H1 --> γ γ的宽度和分支比(BR)有很大影响,而其他光粒子的影响很小。在MSSM参数空间的一些区域中,具有大CP破坏相位φ-μ ~ 90度,与具有重(~ 1 TeV)停止和其他相同MSSM参数的情况相比,光(~ 200 GeV)停止可以改变双光子BR超过50%。

英文摘要:

Physical Higgs particles in the Minimal Supersymmetric Standard Model (MSSM) with explicit CP violation are CP mixed states. The decay of these Higgs particles can be analysed to study the CP properties of the MSSM. In the present work we consider the di-photon channel of the lightest neutral Higgs boson for this purpose. Compared to earlier studies on effects of scalar/pseudo-scalar mixing, our analysis also investigates the effect due to Higgs-sfermion-sfermion couplings along with that of mixing. We find that a light stop may have a strong impact on the width and Branching Ratio (BR) of the decay process H1 --> 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 deg a light (~ 200 GeV) stop can change the di-photon BR by more than 50 % compared to the case with heavy (~ 1 TeV) stop and otherwise same MSSM parameters.

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