来自四夸克相互作用的汤川耦合偏差
Yukawa coupling deviations from four-quark interactions
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中文总结 AI 辅助
该研究探讨不与第一代夸克耦合的四夸克相互作用的探测,发现希格斯-粲、底夸克耦合及FCC-ee可作为敏感观测手段,相关单粒子模型或可通过汤川耦合偏差揭示这类新物理。
中文摘要 AI 辅助
产生四夸克相互作用的新物理在大型强子对撞机(LHC)上可能难以探测,尤其是当它不与第一代夸克耦合时。我们研究了这类相互作用在产生可测量的希格斯-夸克耦合偏差方面的可能作用。我们发现来自味物理和顶夸克对产生的重要约束,但表明希格斯-粲夸克和希格斯-底夸克耦合仍然是LHC对一些含标量流的四夸克算符最敏感的可观测量。在未来环形正负电子对撞机(FCC-ee)上,可测试更多算符和味结构。我们进一步研究了能产生这类相互作用的简单单粒子模型,包括第二个希格斯二重态,以及标量和矢量双夸克。我们发现,在某些情况下,包括与第三代夸克耦合最强的新标量,汤川耦合的偏差可能提供产生四夸克相互作用的新物理的首个迹象。
英文摘要
New physics generating four-quark interactions can be difficult to detect at the LHC, especially if it does not couple to first generation quarks. We investigate the possible role of such interactions in generating measurable deviations in Higgs-quark couplings. We find important constraints from flavour physics and top-pair production, but show that Higgs-charm and Higgs-bottom couplings remain the most sensitive LHC observables to some four-quark operators involving scalar currents. At FCC-ee, more operators and flavour structures can be tested. We further investigate simple single-particle models that can generate these interactions, including a second Higgs doublet, and scalar and vector diquarks. We find that in some cases, including new scalars most strongly coupled to the third generation of quarks, deviations in Yukawa couplings could offer the first signs of new physics generating four-quark interactions.
发表机构
- School of Physics and Astronomy, University of Glasgow(格拉斯哥大学物理与天文学院)
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