SM中的对称性破缺能否由希格斯势的“第二极小值”来决定?

Q2 Physics and Astronomy
A. Cabo, J. Suarez, D. Arrebato, F. Guzmán, J. Acosta
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引用次数: 0

摘要

研究了标准模型(SM)中自发对称性破缺可能是由Top-Higgs汤川相互作用(决定了SM中所谓的“第二极小值”)产生的可能性。在此基础上,对仅包含单个夸克与标量场汤川相互作用的QCD作用进行了扩展。我们对标量场重复计算了模型的双环有效作用。对评估的修正允许选择一个强耦合$\alpha $ ($\mu,\Lambda_{QCD})=0.2254$ GeV)在中间尺度$\mu=11.63$ GeV,以便确定确定夸克质量$175$ GeV的标量场势的最小值。一个标量场质量$m=44$ GeV紧随其后,它比实验希格斯质量的数量级。研究了考虑动量耦合的运行对系统的影响。为此,由强耦合决定的两环势贡献的有限部分被表示为动量积分。然后,将运行耦合的实验值代入该积分,得到的势曲线与恒定耦合的势曲线非常相似。这是在简单地假设耦合的低动量依赖性“饱和”到接近其最低实验值的恒定值之后发生的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Can the symmetry breaking in the SM be determined by the “second minimum” of the Higgs potential?
The possibility that the spontaneous symmetry breaking in the Standard Model (SM) may be generated by the Top-Higgs Yukawa interaction (which determines the so called "second minimum" in the SM) is examined. A former analysis is extended about a QCD action only including the Yukawa interaction of a single quark with a scalar field. We repeat the calculation of the two loop effective action of the model for the scalar field. A correction of the evaluation allowed choosing a strong coupling $\alpha $($\mu,\Lambda_{QCD})=0.2254$ GeV at an intermediate scale $\mu=11.63$ GeV, in order to fix the minimum of the potential at a scalar field determining $175$ GeV for the quark mass. A scalar field mass $m=44$ GeV is following, which is of the order than the experimental Higgs mass. The effects of considering a running with momenta coupling are studied. For this, the finite part of the two loop potential contribution determined by the strong coupling, was represented as a momentum integral. Next, substituting in this integral the experimental values of the running coupling, the potential curve became very similar to the one for constant coupling. This happened after simply assuming that the low momentum dependence of the coupling is "saturated" to a constant value being close to its lowest experimental value.
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来源期刊
Letters in High Energy Physics
Letters in High Energy Physics Physics and Astronomy-Nuclear and High Energy Physics
CiteScore
1.20
自引率
0.00%
发文量
4
审稿时长
12 weeks
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