Vectorlike top quark production via a chromomagnetic moment at the LHC
Vectorlike top quark production via a chromomagnetic moment at the LHC
复制标题
通过大型强子对撞机的色磁矩产生矢量型顶夸克
DOI：
10.1103/physrevd.104.095024
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发表时间：
2021
影响因子：
5
通讯作者：
Wang, Xing
中科院分区：
文献类型：
--
作者：
Belyaev, Alexander;Chivukula, R. Sekhar;Fuks, Benjamin;Simmons, Elizabeth H.;Wang, Xing
为大顶夸克质量提供动力学解释的理论通常包括 TeV 尺度的矢量状顶夸克和底夸克伙伴态，这些可能在大型强子对撞机上被发现。目前通过与模型无关的胶子融合搜索对产生以及通过模型依赖的互补电弱单一产生来探测这些状态。在本文中，我们研究了根据预期的色磁相互作用扩展对第三代标准模型夸克伙伴的搜索的潜力。我们讨论了当前对通过色磁相互作用通过胶子聚变产生的“激发”底夸克的搜索是如何相关的，并提供了重要的限制。然后，我们探索参数空间的区域，其中底夸克伙伴比顶夸克伙伴重，在这种情况下，顶部夸克伙伴可以主要通过底部夸克伙伴的衰变产生。接下来，我们探讨通过胶子聚变产生与普通顶夸克相关的单个顶夸克伴侣的潜力。在运动学上，这两个新过程是相似的，它们产生较重的顶部伙伴和较轻的标准模型状态，这种模式允许拒绝相关的主导标准模型背景。我们研究了在顶部伙伴随后衰变为希格斯玻色子和普通顶夸克的情况下这些模式的敏感性，并且我们证明这些新通道有可能扩展和补充大型强子对撞机运行 III 和大型强子对撞机高光度阶段的传统策略。在最后一种情况下，我们发现可以达到约 3 TeV 的伙伴质量。这大大扩展了这些新状态的预期质量范围，包括传统搜索无法访问的参数空间区域。
Theories which provide a dynamical explanation for the large top quark mass often include TeV-scale vectorlike top quark and bottom quark partner states which can be potentially discovered at the LHC. These states are currently probed through model-independent searches for pair production via gluon fusion, as well as through model-dependent complementary electroweak single production. In this paper we study the potential to extend those searches for the partners of the third-generation Standard Model quarks on the basis of their expected chromomagnetic interactions. We discuss how current searches for “excited” bottom quarks produced via-gluon fusion through chromomagnetic interactions are relevant, and provide significant constraints. We then explore the region of the parameter space in which the bottom quark partner is heavier than the top quark partner, in which case the top partner can be primarily produced via the decay of the bottom partner. Next, we probe the potential of the production of a single top quark partner in association with an ordinary top quark by gluon fusion. Kinematically these two new processes are similar, and they yield the production of a heavy top partner and a lighter Standard Model state, a pattern which allows for the rejection of the associated dominant Standard Model backgrounds. We examine the sensitivity of these modes in the case where the top partner subsequently decays to a Higgs boson and an ordinary top quark, and we demonstrate that these new channels have the potential of extending and complementing the conventional strategies at the LHC run III and at the high-luminosity phase of the LHC. In this last case, we find that partner masses that range up to about 3 TeV can be reached. This substantially expands the expected mass reach for these new states, including regions of parameter space that are inaccessible by traditional searches.