Constraining a fourth generation of quarks: non-perturbative Higgs boson mass bounds
Constraining a fourth generation of quarks: non-perturbative Higgs boson mass bounds
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DOI：
10.1016/j.physletb.2013.04.041
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发表时间：
2013-01
影响因子：
4.4
通讯作者：
J. Bulava;K. Jansen;A. Nagy
中科院分区：
文献类型：
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作者：
J. Bulava;K. Jansen;A. Nagy
在手征对称的Higgs-Yukawa模型中，通过数值格子计算，我们给出了重第四代夸克的Higgs玻色子质量上界和下界的非微扰确定。我们发现，上界只随着夸克质量的增加而适度增加，而下界则显著增加，这为直接的第四代夸克的存在提供了额外的约束。我们用微扰理论研究了高维算符加入标量场势时下界的稳定性，证明了当高维算符的耦合系数较小时，下界的稳定性没有明显的变化。对于∼为125GeV的希格斯玻色子质量，我们发现第四代夸克质量的最大值为∼300GeV，这已经与直接搜索的界限相冲突。
We present a non-perturbative determination of the upper and lower Higgs boson mass bounds with a heavy fourth generation of quarks from numerical lattice computations in a chirally symmetric Higgs–Yukawa model. We find that the upper bound only moderately rises with the quark mass while the lower bound increases significantly, providing additional constraints on the existence of a straight-forward fourth quark generation. We examine the stability of the lower bound under the addition of a higher dimensional operator to the scalar field potential using perturbation theory, demonstrating that it is not significantly altered for small values of the coupling of this operator. For a Higgs boson mass of ∼125 GeV we find that the maximum value of the fourth generation quark mass is ∼300 GeV, which is already in conflict with bounds from direct searches.