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arXiv 2211.09147hep-ph
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关于TeV-Scale超对称电弱重子生成

Towards TeV-Scale Supersymmetric Electroweak Baryogenesis

Oleksii Matsedonskyi, James Unwin, Qingyun Wang

备注：
version accepted for publication in JHEP
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摘要：

电弱重子生成（EWBG）为重子不对称性的产生提供了一个令人信服的解释，然而它在标准模型中无法实现，并导致了最小超对称标准模型（MSSM）中严重的实验紧张。这些实验紧张的原因之一是，在传统的EWBG方法中，新的物理需要进入电弱相变，这通常是固定在$\sim$ 100 GeV附近。在这里，我们证明了在标准模型的超对称扩展中添加子TeV场允许TeV尺度的强一阶电弱相变。虽然早期的文献建议不去的参数，关于高温对称性破缺超对称模型，我们表明，这些可以通过采用系统的抑制某些热修正理论与大量的状态。所提出的模型将EWBG所需的新物理推向更高的尺度，从而提出了实现EWBG和逃避实验紧张局势的新参数区域，但预计它们不会使EWBG完全超出可预见的未来实验范围。

英文摘要：

Electroweak baryogenesis (EWBG) offers a compelling narrative for the generation of the baryon asymmetry, however it cannot be realised in the Standard Model, and leads to severe experimental tensions in the Minimal Supersymmetric Standard Model (MSSM). One of the reasons for these experimental tensions is that in traditional approaches to EWBG new physics is required to enter at the electroweak phase transition, which conventionally is fixed near $\sim$100 GeV. Here we demonstrate that the addition of sub-TeV fields in supersymmetric extensions of the Standard Model permits TeV-scale strongly first-order electroweak phase transition. While earlier literature suggested no-go arguments with regards to high-temperature symmetry breaking in supersymmetric models, we show these can be evaded by employing a systematic suppression of certain thermal corrections in theories with a large number of states. The models presented push the new physics needed for EWBG to higher scales, hence presenting new parameter regions in which to realize EWBG and evade experimental tensions, however they are not expected to render EWBG completely outside of the foreseeable future experimental reach.

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