arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2111.03080hep-ph
收藏

在SMEFT的LHC处与一对$WZ$联合进行单顶生产

Single top production in association with a $WZ$ pair at the LHC in the SMEFT

Hesham El Faham, Fabio Maltoni, Ken Mimasu, Marco Zaro

摘要:

我们在标准模型(SM)和标准模型有效场论(SMEFT)的背景下研究了LHC中与$WZ$对相关的单顶夸克产生。与其他EW顶部生产过程相比,$tWZ$的一个显著优势是其对通过修改的EW相互作用在其$2\to2$子振幅中诱导的幺正性违反行为的敏感性。在QCD的NLO中,$tWZ$干扰了$t\bar{t}Z$和$t\bar{t}$,需要采用一种方法将其与这些重叠过程有意义地分离。为了定义$tWZ$生产的总速率和差分分布,我们认为在文献中提出的方法,类似的情况下,并发现,去除程序提供了可靠的结果为SM和SMEFT在一个适当定义的相空间区域。我们提供了强大的结果$tWZ$在13 TeV的总截面和微分截面,包括6个相关的维度-6运营商($\mathcal{O}_{tW}$,$\mathcal{O}_{tZ}$,$\mathcal{O}_{tG}$,$\mathcal{O}_{ϕQ}^{(-)}$,$\mathcal{O}_{ϕQ}^{(3)}$,$\mathcal{O}_{ϕt}$),也匹配短距离事件的部分子淋浴。

英文摘要:

We study single top quark production in association with a $WZ$ pair at the LHC in the context of the Standard Model (SM) and the Standard Model Effective Field Theory (SMEFT). A significant advantage of $tWZ$ compared to other EW top production processes is its sensitivity to unitarity-violating behaviour induced in its $2\to2$ sub-amplitudes through modified EW interactions. At NLO in QCD, $tWZ$ interferes with $t\bar{t}Z$ and $t\bar{t}$ and a method to meaningfully separate it from these overlapping processes needs to be employed. In order to define $tWZ$ production for total rates and differential distributions, we consider the approaches proposed in the literature for similar cases and find that diagram-removal procedures provide reliable results both for the SM and the SMEFT in a suitably defined phase-space region. We provide robust results for total and differential cross sections for $tWZ$ at 13 TeV, including the six relevant dimension-6 operators ($\mathcal{O}_{tW}$,$\mathcal{O}_{tZ}$,$\mathcal{O}_{tG}$,$\mathcal{O}_{ϕQ}^{(-)}$,$\mathcal{O}_{ϕQ}^{(3)}$,$\mathcal{O}_{ϕt}$), also matching short-distance events to parton shower.

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。

↑