Title: Search for $W^\prime$ signal via $tW^\prime$ associated production at LHC Show Chinese title

Title: 通过LHC上的$tW^\prime$关联产生搜索$W^\prime$信号

Abstract: A variety of new physics models predict the existence of extra charged gauge bosons ($W^\prime$). It is verified that $W^\prime$ and top quark associated production is a promising process to search for $W^\prime$ signal at the LHC. We study the collider signatures of multi-jets$+$lepton$+\met$ by reconstructing the $tW'$ intermediate state through the decay modes of $W^\prime \to tb$, $W^\prime \to q \bar q'$ and $W^\prime \to l \nu$ respectively. An angular distribution related to charged lepton and top quark moving direction is provided to distinguish alternative left-handed or right-handed chiral couplings of $W^\prime$ to quarks in the hadronic decay modes. The superiority on the search of $W^\prime$ is demonstrated in the leptonic decay channel for the left-handed type interaction, which is forbidden for the right-handed type interaction in the most theories. To be more realistic, the relevant standard model backgrounds are simulated. We adopt various kinematic cuts to suppress the backgrounds and collect the integral luminosity needed for the corresponding process detected at the LHC with $3\sigma$ sensitivity. We also provide a forward-backward asymmetry which is related to the chirality of $W^\prime$. The successive studies can shed light on the potential searching for $W^\prime$ signal as well as distinguishing typical new physics models. Show Chinese abstract

Abstract: 各种新的物理模型预测了额外带电规范玻色子（$W^\prime$）的存在。 已经验证了$W^\prime$和顶夸克相关产生是一个有前景的过程，用于在大型强子对撞机上搜索$W^\prime$信号。 我们研究多 jets$+$轻子$+\met$的对撞机信号，通过分别衰变模式重建$tW'$中间态，即$W^\prime \to tb$、$W^\prime \to q \bar q'$和$W^\prime \to l \nu$。提供与带电轻子和顶夸克运动方向相关的角度分布，以区分$W^\prime$在强子衰变模式中对夸克的替代左手或右手手性耦合。 在左旋相互作用的轻子衰变通道中，$W^\prime$的搜索优势得到了证明，而在大多数理论中，右旋相互作用是被禁止的。 为了更真实，相关标准模型背景被模拟。 我们采用各种运动学截断来抑制背景，并收集在LHC上以$3\sigma$灵敏度检测相应过程所需的积分亮度。 我们还提供了一个与$W^\prime$的手性相关的前后不对称性。 后续研究可以为$W^\prime$信号的潜在搜索以及区分典型的新物理模型提供启示。