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arXiv 1603.04488hep-ph
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750 GeV双光子过剩与强一级电弱相变

750 GeV Di-photon Excess and Strongly First-Order Electroweak Phase Transition

Maxim Perelstein, Yu-Dai Tsai

摘要:

一个新的标量粒子,耦合到光子和胶子通过环的矢量类夸克,提供了一个简单的理论解释的750 GeV的双光子过剩的实验报告在大型强子对撞机(LHC)。在本文中,我们表明,该模型包含一个大的,唯象可行的参数空间区域中的电弱相变(EWPT)是强烈的一阶,打开的可能性,电弱重子机制可以实现在这种情况下。一个强的一阶EWPT所需的希格斯偶线和重标量之间的大耦合,可以在复合希格斯模型中自然出现。该方案做出了强有力的预测,将在不久的将来的实验中进行测试。在13 TeV LHC的共振di-Higgs生产的横截面被预测为至少20 fb,而Higgs立方自耦合增强了40%或更多的标准模型(SM)的值。

英文摘要:

A new scalar particle, coupled to photons and gluons via loops of vector-like quarks, provides a simple theoretical interpretation of the 750 GeV diphoton excess reported by the experiments at the Large Hadron Collider (LHC). In this paper, we show that this model contains a large, phenomenologically viable parameter space region in which the electroweak phase transition (EWPT) is strongly first-order, opening the possibility that electroweak baryogenesis mechanism can be realized in this context. A large coupling between the Higgs doublet and the heavy scalar, required for a strongly first-order EWPT, can arise naturally in composite Higgs models. The scenario makes robust predictions that will be tested in near-future experiments. The cross section of resonant di-Higgs production at the 13 TeV LHC is predicted to be at least 20 fb, while the Higgs cubic self-coupling is enhanced by 40% or more with respect to its Standard Model (SM) value.

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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