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arXiv 0711.0935hep-ph
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CP破坏和H-A线形

CP violation and the H-A lineshape

J. Bernabeu, D. Binosi, J. Papavassiliou

摘要:

在两希格斯双重态模型中(尤其是在MSSM中),CP偶(H)和CP奇(A)中性标量的质量几乎简并,它们的s通道产生将导致几乎重叠的共振。CP破坏效应可能将这两个希格斯玻色子连接起来,从而产生单圈粒子混合,由于它们的质量接近,可以共振增强,显著改变它们的线形。我们表明,在一般情况下,这样的CP违反混合的效果不能模仿(或重新吸收到)一个简单的重新定义的H和A质量的CP守恒模型的上下文中。具体地说,CP混合的影响是这样的,要么H和A玻色子的质量分裂在没有CP混合的情况下位于理论允许的范围之外,和/或所产生的线型的详细能量依赖性明显不同于通过重新定义质量而不允许任何混合而获得的线型。

英文摘要:

In two-Higgs doublet models (and particularly in the MSSM) the CP-even (H) and CP-odd (A) neutral scalars are nearly degenerate in mass, and their s-channel production would lead to nearly overlapping resonances. CP-violating effects may connect these two Higgs bosons, giving origin to one-loop particle mixing, which, due to their mass proximity, can be resonantly enhanced, altering their lineshape significantly. We show that, in general, the effect of such a CP-violating mixing cannot be mimicked by (or be re-absorbed into) a simple redefinition of the H and A masses in the context of a CP-conserving model. Specifically, the effects of the CP-mixing are such that, either the mass-splitting of the H and A bosons lies outside the range allowed by the theory in the absence of CP-mixing, and/or the detailed energy dependence of the produced lineshape is clearly different from the one obtained by redefining the masses, but not allowing any mixing.

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