Probing the low mass pseudoscalar in the flipped two-Higgs-doublet model

IF 5.3 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2025-10-17 DOI:10.1103/nfzx-96x1

Dilip Kumar Ghosh, Biswarup Mukhopadhyaya, Sirshendu Samanta, Ritesh K. Singh

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Abstract

The phenomenology of the flipped two-Higgs-doublet model (2HDM) is relatively less explored so far, as compared to the other, commonly discussed, types. It is found that this scenario, like several others, admits of a light neutral pseudoscalar A in the mass range 20–60 GeV, consistently with all current experimental data and theoretical constraints. However, the fact that such a pseudoscalar decays overwhelmingly into a bb¯ pair makes its identification at the Large Hadron Collider (LHC) a challenging task. After identifying the region of the flipped 2HDM parameter space yielding a light pseudoscalar, we identify a useful search channel in the process pp→AZ(Z*)→bb¯ℓ+ℓ−. A cut-based analysis, followed by one based on boosted decision trees, shows that the light-A scenario in flipped 2HDM should be detectable with rather high statistical significance at the high-luminosity LHC run, even after including systematic uncertainties. Furthermore, part of the parameter space, especially around mA=30–40 GeV, is amenable to detection at the discovery level within Run-2 itself.

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探测翻转双希格斯双重态模型中的低质量伪标量

翻转双希格斯双重态模型（2HDM）的现象学迄今为止相对较少探索，与其他常见的讨论类型相比。我们发现，这个场景，像其他几个场景一样，承认在20-60 GeV的质量范围内存在一个轻中性伪标量a，与所有当前的实验数据和理论约束一致。然而，这样的伪标量绝大多数会衰变成bb¯对，这使得在大型强子对撞机（LHC）上对其进行识别成为一项具有挑战性的任务。在确定翻转2HDM参数空间产生轻伪标量的区域后，我们在pp→AZ（Z*）→bb¯r + r−的过程中确定了一个有用的搜索通道。一项基于切割的分析，以及随后一项基于增强决策树的分析表明，在高亮度的LHC运行中，即使考虑了系统不确定性，翻转2HDM中的light-A场景也应该被检测到，具有相当高的统计显著性。此外，部分参数空间，特别是在mA= 30-40 GeV附近，可以在Run-2本身的发现级别进行检测。

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

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.