arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.14022hep-phastro-ph.CO
收藏

标准模型有效场论中电弱相变的新观点

A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory

José Eliel Camargo-Molina, Rikard Enberg, Johan Löfgren

摘要:

一阶电弱相变(EWPT)可以解释观察到的重子-反重子不对称性,其动力学可以产生可检测的引力波特征,而潜在的物理学将在对撞机的范围内。然而,标准模型预测了一个交叉过渡。因此,我们研究的EWPT在标准模型有效场论(SMEFT),包括六维运营商。一阶EWPT先前已被证明是可能的SMEFT。唯象学的研究集中在最小值之间有一个树级障碍的场景,这需要一个负的希格斯四次耦合和一个新的物理尺度足够低,以提出关于EFT方法的有效性的问题。在这项工作中,我们强调,一阶EWPT也是可能的,当极小值之间的障碍是辐射产生的,四次耦合是积极的,新的物理尺度更高,并有很好的协议与实验界限。我们的计算是在一个一致的,规范不变的方式,我们仔细分析的缩放所需的参数,以产生一个潜在的障碍。我们在相关的参数空间中进行全局拟合,并明确找到与实验数据一致的一阶跃迁点。我们还简要地讨论了探测允许的参数空间,在对撞机中使用di-希格斯生产的前景。

英文摘要:

A first-order Electroweak Phase Transition (EWPT) could explain the observed baryon-antibaryon asymmetry and its dynamics could yield a detectable gravitational wave signature, while the underlying physics would be within the reach of colliders. The Standard Model, however, predicts a crossover transition. We therefore study the EWPT in the Standard Model Effective Field Theory (SMEFT) including dimension-six operators. A first-order EWPT has previously been shown to be possible in the SMEFT. Phenomenology studies have focused on scenarios with a tree-level barrier between minima, which requires a negative Higgs quartic coupling and a new physics scale low enough to raise questions about the validity of the EFT approach. In this work we stress that a first-order EWPT is also possible when the barrier between minima is generated radiatively, the quartic coupling is positive, the scale of new physics is higher, and there is good agreement with experimental bounds. Our calculation is done in a consistent, gauge-invariant way, and we carefully analyze the scaling of parameters necessary to generate a barrier in the potential. We perform a global fit in the relevant parameter space and explicitly find the points with a first-order transition that agree with experimental data. We also briefly discuss the prospects for probing the allowed parameter space using di-Higgs production in colliders.

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。

↑