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arXiv 0901.0524hep-phgr-qc
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对MSSM有限温度Higgs势的阈值修正

Threshold corrections to the MSSM finite-temperature Higgs potential

M. Dolgopolov, M. Dubinin, E. Rykova

摘要:

在最小超对称标准模型(MSSM)中,计算了夸克- Higgs玻色子扇区的单圈有限温度修正,重建了有效的2-Higgs偶极势,研究了全MSSM($m_{H^\pm}$,${\tt tg}β$,$A_{t,b}$,$μ$,$m_Q$,$m_U$,$m_D$)参数空间中电弱相变的可能性.在$A_{t,b}$和$μ$约为1 TeV的大值时,LEP 2和Tevatron数据间接支持,三角形和箱形图的阈值有限温度校正与中间第三代方波非常可观。定义了两Higgs偶极势的四种分岔集。高灵敏度的低温演变的有效的两个双重和MSSM的squark扇区参数进行观察,但相当广泛的区域的完整的MSSM参数空间允许一阶电弱相变尊重在零温度下的唯象约束。一般来说,MSSM参数空间的这些区域与光阻夸克的情况一致。

英文摘要:

In the minimal supersymmetric standard model (MSSM) the one-loop finite-temperature corrections from the squark-Higgs bosons sector are calculated, the effective two-Higgs-doublet potential is reconstructed and possibilities of the electroweak phase transition in full MSSM ($m_{H^\pm}$, ${\tt tg}β$, $A_{t,b}$, $μ$, $m_Q$, $m_U$, $m_D$) parameter space are studied. At large values of $A_{t,b}$ and $μ$ of around 1 TeV, favored indirectly by LEP2 and Tevatron data, the threshold finite-temperature corrections from triangle and box diagrams with intermediate third generation squarks are very substantial. The four types of bifurcation sets are defined for the two-Higgs-doublet potential. High sensitivity of the low-temperature evolution to the effective two-doublet and the MSSM squark sector parameters is observed, but rather extensive regions of the full MSSM parameter space allow the first-order electroweak phase transition respecting the phenomenological constraints at zero temperature. As a rule, these regions of the MSSM parameter space are in line with the case of a light stop quark.

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