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arXiv 2107.09617hep-ph
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含BSM费米子的电弱相变

Electroweak Phase Transitions with BSM Fermions

Martin Gabelmann, M. Margarete Mühlleitner, Jonas Müller

摘要:

本文研究了在标准模型$SU(2)_L \otimes U(1)_Y$规范群下附加的超标准模型费米子对II型2-Higgs-Doublet模型中的电弱相变的影响。我们发现,EWPT的强度可以提高约40%,相比默认的2 HDM。因此,额外的轻费米子是一个有用的工具,以削弱增加BSM标量的质量约束和额外的轻标量自由度的要求,以适应一个强大的一阶EWPT之间的紧张局势。这些发现是特别感兴趣的各种(非最小)分裂超对称的情况下,必然会引入额外的光费米子自由度。

英文摘要:

We study the impact of additional beyond-the-Standard Model (BSM) fermions, charged under the Standard Model (SM) $SU(2)_L \otimes U(1)_Y$ gauge group, on the electroweak phase transition (EWPT) in a 2-Higgs-Doublet-Model (2HDM) of type II. We find that the strength of the EWPT can be enhanced by about 40% compared to the default 2HDM. Therefore, additional light fermions are a useful tool to weaken the tension between increasing mass constraints on BSM scalars and the requirement of additional light scalar degrees of freedom to accommodate a strong first order EWPT. The findings are of particular interest for a variety of (non-minimal) split supersymmetry scenarios which necessarily introduce additional light fermion degrees of freedom.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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