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arXiv 1704.03381hep-ph
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单态标量扩展标准模型中的电弱相变动力学

Dynamics of Electroweak Phase Transition In Singlet-Scalar Extension of the Standard Model

Gowri Kurup, Maxim Perelstein

摘要:

在标准模型中加入一个真实的规范单重标量场,通过希格斯门相互作用耦合,可以重新打开一个强一阶电弱相变(EWPT)和成功的电弱重子生成(EWBG)的可能性。如果存在一个不允许二重态-单重态混合的离散对称性,这个模型就很难在大型强子对撞机上进行测试。因此,它成为一个有用的基准,用于评估拟议的未来对撞机的能力,以最终测试EWPT和EWBG。在本文中,我们评估整个参数空间的气泡成核温度的一阶过渡,预计这个模型。我们发现,在这个参数空间的大部分,气泡实际上不成核在任何有限的温度下,消除这些模型作为可行的EWBG方案。这种约束消除了大部分的区域,其中“两步”相变是天真地预测,而“一步”过渡区在很大程度上不受影响。此外,在重子不对称性产生的过渡过程中,膨胀的气泡壁不能达到相对论速度。我们表明,这个条件进一步减少了可行的EWBG的参数空间。

英文摘要:

An addition to the Standard Model of a real, gauge-singlet scalar field, coupled via a Higgs portal interaction, can reopen the possibility of a strongly first-order electroweak phase transition (EWPT) and successful electroweak baryogenesis (EWBG). If a discrete symmetry that forbids doublet-singlet mixing is present, this model is notoriously difficult to test at the Large Hadron Collider. As a result, it emerged as a useful benchmark for evaluating the capabilities of proposed future colliders to conclusively test EWPT and EWBG. In this paper, we evaluate the bubble nucleation temperature throughout the parameter space of this model where a first-order transition is expected. We find that in large parts of this parameter space, bubbles in fact do not nucleate at any finite temperature, eliminating these models as viable EWBG scenarios. This constraint eliminates most of the region where a "two-step" phase transition is naively predicted, while the "one-step" transition region is largely unaffected. In addition, expanding bubble walls must not reach relativistic speeds during the transition for baryon asymmetry to be generated. We show that this condition further reduces the parameter space with viable EWBG.

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