Towards TeV-scale supersymmetric electroweak baryogenesis
Towards TeV-scale supersymmetric electroweak baryogenesis
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DOI：
10.1007/jhep02(2023)198
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发表时间：
2022-11
影响因子：
5.4
通讯作者：
O. Matsedonskyi;James Unwin;Qingyun Wang
中科院分区：
文献类型：
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作者：
O. Matsedonskyi;James Unwin;Qingyun Wang
弱电重子发生(EWBG)为重子不对称的产生提供了一个令人信服的叙述，然而它不能在标准模型中实现，并导致在最小超对称标准模型(MSSM)中产生严重的实验张力。造成这些实验紧张的原因之一是，在EWBG的传统方法中，需要在电弱相变进入新的物理，该相变通常固定在100GeV附近。在本文中，我们证明了在标准模型的超对称扩展中加入亚TeV场可以实现TeV尺度的强一阶电弱相变。虽然早期的文献提出了关于超对称模型中高温对称性破缺的不可行论点，但我们表明，在具有大量态的理论中，可以通过系统地抑制某些热修正来避免这些论点。所提出的模型将EWBG所需的新物理推到了更高的尺度上，从而为实现EWBG和避免实验张力提供了新的参数区域，但它们不会使EWBG完全超出可预见的未来实验范围。
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 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.