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arXiv 0907.3300hep-ph
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在最小超对称标准模型之外Higgs物理中自发CP破坏的可能性

Possibility of spontaneous CP violation in Higgs physics beyond the minimal supersymmetric standard model

S. W. Ham, Seong-a Shim, S. K. OH

摘要:

Dine-Seiberg-Thomas模型(DSTM)是最小超对称标准模型(MSSM)之外的新物理学的最简单版本,它的Higgs扇区只有两个五维算符,这两个算符是从新物理学的有效作用量分析的能量标度的幂级数中得到的。我们研究了由两个Higgs二重态组成的DSTM的Higgs扇区中自发CP破坏的可能性。我们发现,CP破坏可能是由复相位自发触发的,复相位是两个希格斯双重态真空期望值之间的相对相位。在树的层次上,对于合理建立的参数区域,计算了DSTM中三个中性希格斯玻色子的质量及其与一对$Z$玻色子的耦合系数,结果与LEP数据的实验约束不一致.因此,LEP 2数据排除了树级DSTM中自发CP破坏的可能性。另一方面,我们发现,在一个广泛的区域中的参数区域,CP对称性可以自发破缺的DSTM在单圈水平的Higgs部门,其中顶夸克和标量顶夸克圈考虑。在自发CP破坏的情况下,DSTM中最轻的中性希格斯玻色子的辐射校正质量的上限约为87 GeV。我们确认LEP数据并不排除这一数值结果。

英文摘要:

The Dine-Seiberg-Thomas model (DSTM) is the simplest version of the new physics beyond the minimal supersymmetric standard model (MSSM), in the sense that its Higgs sector has just two dimension-five operators, which are obtained from the power series of the energy scale for the new physics in the effective action analysis. We study the possibility of spontaneous CP violation in the Higgs sector of the DSTM, which consists of two Higgs doublets. We find that the CP violation may be triggered spontaneously by a complex phase, obtained as the relative phase between the vacuum expectation values of the two Higgs doublets. At the tree level, for a reasonably established parameter region, the masses of the three neutral Higgs bosons and their corresponding coupling coefficients to a pair of $Z$ bosons in the DSTM are calculated such that the results are inconsistent with the experimental constraint by the LEP data. Thus, the LEP2 data exclude the possibility of spontaneous CP violation in the DSTM at the tree level. On the other hand, we find that, for a wide area in the parameter region, the CP symmetry may be broken spontaneously in the Higgs sector of the DSTM at the one-loop level, where top quark and scalar top quark loops are taken into account. The upper bound on the radiatively corrected mass of the lightest neutral Higgs boson of the DSTM is about 87 GeV, in the spontaneous CP violation scenario. We confirm that the LEP data does not exclude this numerical result.

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