论文标题
在LHC上用leptoquarks增强标量生产
Enhancing Scalar Productions with Leptoquarks at the LHC
论文作者
论文摘要
标准模型（SM）用Leptokark（LQ）和右撇子中微子扩展时，对HIGGS物理学有有趣的新含义。我们表明，无菌中微子可以通过与夸克相关的对角线耦合和电磁电荷标量LQ $ 1/3 $来诱导Yukawa Quark Yukawa相互作用的增强。在前两代夸克中，相对变化较大，因为它们在SM中消失了小的Yukawa耦合。耦合的增强还将导致从夸克融合过程到SM中125 GEV Higgs标量生产的不可忽视的贡献，尽管Gluon融合始终占主导地位。但是，对于一般标量，这可能不是正确的。例如，我们考虑使用sm-gauge-singlet标量$ ϕ $的方案，其中允许$ \ mathcal o（1）$耦合在$ ϕ $和LQ之间。 $ ϕQ \ bar {q} $ yukawa耦合只能通过LQ和无菌中微子的环辐射生成。在这里，夸克融合过程可以具有重要的横截面，尤其是对于轻$ ϕ $。它甚至可以取代正常到的LQ质量价值的通常主导的Gluon融合过程。该模型可以在LHC的高光度运行下通过标量量的大型分支分数到两个喷头进行测试/约束。
The Standard Model (SM), when extended with a leptoquark (LQ) and right-handed neutrinos, can have interesting new implications for Higgs physics. We show that sterile neutrinos can induce a boost to the down-type quark Yukawa interactions through a diagonal coupling associated with the quarks and a scalar LQ of electromagnetic charge $1/3$. The relative change is moderately larger in the case of the first two generations of quarks, as they have vanishingly small Yukawa couplings in the SM. The enhancement in the couplings would also lead to a non-negligible contribution from the quark fusion process to the production of the 125 GeV Higgs scalar in the SM, though the gluon fusion always dominates. However, this may not be true for a general scalar. As an example, we consider a scenario with a SM-gauge-singlet scalar $ϕ$ where an $\mathcal O(1)$ coupling between $ϕ$ and the LQ is allowed. The $ϕq \bar{q}$ Yukawa couplings can be generated radiatively only through a loop of LQ and sterile neutrinos. Here, the quark fusion process can have a significant cross section, especially for a light $ϕ$. It can even supersede the normally dominant gluon fusion process for a moderate to large value of the LQ mass. This model can be tested/constrained at the high luminosity run of the LHC through a potentially large branching fraction of the scalar to two jets.
