潜在的第四代费米子对希格斯玻色子质量上限和下限的影响
Effects of a potential fourth fermion generation on the upper and lower Higgs boson mass bounds
摘要：
我们研究了第四代费米子对希格斯玻色子质量边界的影响。这项调查是基于数值计算的手征不变的晶格希格斯汤川模型模拟相同的希格斯费米子耦合结构的希格斯部门的电弱标准模型。特别是，所考虑的模型服从一个Ginsparg-Wilson版本的基本${SU}(2)_L\times {U}(1)_Y$对称性，是一个全球性的对称性在这里由于忽略了规范场在这个模型中。我们提出了我们的结果上的修改和下的希格斯玻色子玻色子质量边界的存在下引起的一个假设的非常重的第四夸克偶。最后，我们将这些发现与三代费米子的标准场景进行了比较。
英文摘要：
We study the effect of a potential fourth fermion generation on the upper and lower Higgs boson mass bounds. This investigation is based on the numerical evaluation of a chirally invariant lattice Higgs-Yukawa model emulating the same Higgs-fermion coupling structure as in the Higgs sector of the electroweak Standard Model. In particular, the considered model obeys a Ginsparg-Wilson version of the underlying ${SU}(2)_L\times {U}(1)_Y$ symmetry, being a global symmetry here due to the neglection of gauge fields in this model. We present our results on the modification of the upper and lower Higgs boson mass bounds induced by the presence of a hypothetical very heavy fourth quark doublet. Finally, we compare these findings to the standard scenario of three fermion generations.
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