arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.13385hep-ph
收藏

标量双夸克的LHC约束

LHC Constraints on Scalar Diquarks

Bruna Pascual-Dias, Pratishruti Saha, David London

备注：
17 pages, 8 figures, new references added
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

几年前，人们研究了标量双夸克（与两个夸克耦合的粒子）的低能约束。发现两种最弱约束的双夸克是$D^u$和$D^d$，它们分别与$u_{R}^{i} u_{R}^{j}$和$d_{R}^{i} d_{R}^{j}$耦合。这些双夸克在LHC中还没有被观察到。在本文中，我们加入了LHC测量的低能分析，并发现约束显着改善。作为一个例子，将$x^u$表示为与第一代和第二代的$D^u$耦合，对于$M_{D^u} = 600$ GeV，低能约束是$|x^u| \leq 14.4$，而增加LHC dijet测量导致$|x^u| \leq 0.13$ -- $0.15$。进一步的改进是通过增加测量单顶生产与$p_T$削减。在预测双夸克的其他低能间接效应时，必须考虑这些新的约束。

英文摘要：

A number of years ago, low-energy constraints on scalar diquarks, particles that couple to two quarks, were examined. It was found that the two most weakly-constrained diquarks are $D^u$ and $D^d$, colour antitriplets that couple to $u_{R}^{i} u_{R}^{j}$ and $d_{R}^{i} d_{R}^{j}$, respectively. These diquarks have not been observed at the LHC. In this paper, we add the LHC measurements to the low-energy analysis, and find that the constraints are significantly improved. As an example, denoting $x^u$ as the $D^u$ coupling to the first and second generations, for $M_{D^u} = 600$ GeV, the low-energy constraint is $|x^u| \leq 14.4$, while the addition of the LHC dijet measurement leads to $|x^u| \leq 0.13$--$0.15$. Further improvements are obtained by adding the measurement of single top production with a $p_T$ cut. These new constraints must be taken into account in making predictions for other low-energy indirect effects of diquarks.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑