Precision prediction of a democratic up-family philic KSVZ axion model at the LHC

IF 5 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Anupam Ghosh , Partha Konar
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引用次数: 0

Abstract

In this work, we study the SU(2)L singlet complex scalar extended KSVZ model that, in addition to providing a natural solution to the strong-CP problem, furnishes two components of dark matter that satisfy observer relic density without fine-tuning the model’s parameters. A colored vector-like quark (VLQ) is naturally present in the KSVZ axion model, providing a rich dark matter and collider phenomenology. In this extended model, scalar dark matter interacts with the Standard Model up-type quarks (up, charm, top) through VLQ. We explore the possibility of democratic Yukawa interaction of the VLQ with all up-type quarks and scalar dark matter candidate. We also employ next-to-leading order NLO-QCD correction on dominant production channels for VLQ pair production to study a unique search at the LHC, generating a pair of boosted tops with sizeable missing transverse momentum. Such corrections are significant and reduce factorization and renormalization scale uncertainties substantially. The NLO fixed order results are matched with the Pythia8 parton shower. After being pair-produced, each VLQ decays into a dark matter and a top quark. We conducted a multivariate analysis using jet substructure variables of boosted top fatjets with a significant missing transverse momentum signal. This analysis allows us to explore a substantial parameter space of this model at the 14 TeV LHC.
在大型强子对撞机上民主亲上家族KSVZ轴子模型的精度预测
在这项工作中,我们研究了SU(2)L单重态复标量扩展KSVZ模型,该模型除了提供了强cp问题的自然解外,还提供了满足观测者遗迹密度的两个暗物质分量,而无需微调模型参数。一个彩色的类矢量夸克(VLQ)自然存在于KSVZ轴子模型中,提供了丰富的暗物质和对撞机现象学。在这个扩展模型中,标量暗物质通过VLQ与标准模型上型夸克(上、粲、顶)相互作用。我们探索了VLQ与所有上型夸克和标量候选暗物质的民主汤川相互作用的可能性。我们还对VLQ对生产的主要生产通道采用次优阶NLO-QCD校正,以研究在LHC上的独特搜索,产生一对具有相当大的横向动量缺失的提升顶部。这种修正是显著的,并大大减少了因式分解和重整化尺度的不确定性。NLO定序结果与Pythia8 parton淋浴相匹配。在成对产生之后,每个VLQ都会衰变成一个暗物质和一个顶夸克。我们使用显著缺失横向动量信号的增压顶喷气机的射流子结构变量进行了多变量分析。这一分析使我们能够在14tev大型强子对撞机上探索该模型的大量参数空间。
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来源期刊
Physics of the Dark Universe
Physics of the Dark Universe ASTRONOMY & ASTROPHYSICS-
CiteScore
9.60
自引率
7.30%
发文量
118
审稿时长
61 days
期刊介绍: Physics of the Dark Universe is an innovative online-only journal that offers rapid publication of peer-reviewed, original research articles considered of high scientific impact. The journal is focused on the understanding of Dark Matter, Dark Energy, Early Universe, gravitational waves and neutrinos, covering all theoretical, experimental and phenomenological aspects.
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