Studying Same-Sign Top Pair Production through Top-Higgs FCNC Interactions at the HL-LHC

IF 1.5 4区物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS

Advances in High Energy Physics Pub Date : 2021-05-09 DOI:10.1155/2022/4299254

O. M. Ozsimsek, V. Ari, O. University, A. University

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引用次数: 1

Abstract

We investigate the potential of the HL-LHC for discovering new physics effects via the same-sign top pair signatures. We focus on the semileptonic (electron and muon) decay of the top quarks and study the reach for a simplified model approach where top quark flavor changing could occur through a neutral scalar exchange. A relatively smaller background contribution and clean signature are the advantages of the leptonic decay mode of the same-sign W bosons in the same-sign production processes of top quark pairs. Assuming the FCNC between top quark, up-type quark, and scalar boson from the new physics interactions, the branchings could be excluded of the order O 1 0 − 4 . We use angular observables of the same-sign lepton pairs and the top quark kinematics in the process which provide the possibility of separation of new physics signal from the SM backgrounds using machine-learning techniques. We find that the same-sign top quark pair production is quite capable of testing the top-Higgs FCNCs at the HL-LHC.

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从HL-LHC的顶部Higgs-FCNC相互作用研究同符号顶部对的产生

我们研究了HL-LHC通过相同的正负号对特征发现新物理效应的潜力。我们专注于顶夸克的半轻子（电子和μ子）衰变，并研究了简化模型方法的范围，其中顶夸克的风味变化可以通过中性标量交换发生。在顶夸克对的相同符号产生过程中，相同符号W玻色子的轻子衰变模式具有相对较小的背景贡献和干净的特征。假设在新的物理相互作用中，顶夸克、上型夸克和标量玻色子之间存在FCNC，则可以排除O 1 0−4阶的分支。我们在这个过程中使用了相同符号轻子对的角可观测性和顶夸克运动学，这提供了使用机器学习技术从SM背景中分离新物理信号的可能性。我们发现，相同符号的顶夸克对产生完全有能力在HL-LHC测试顶部希格斯FCNC。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in High Energy Physics PHYSICS, PARTICLES & FIELDS-

CiteScore

3.40

自引率

5.90%

发文量

审稿时长

6-12 weeks

期刊介绍： Advances in High Energy Physics publishes the results of theoretical and experimental research on the nature of, and interaction between, energy and matter. Considering both original research and focussed review articles, the journal welcomes submissions from small research groups and large consortia alike.