通过LHC上的伴随规范玻色子反冲和极化来探测轴子类粒子
Probing axion-like particles through associated gauge-boson recoil and polarization at the LHC
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中文总结 AI 辅助
本文利用HL-LHC上伴随规范玻色子产生的ALP衰变到双光子过程，通过反冲和极化特征结合XGBoost分析，显著提升了对电弱ALP耦合的探测灵敏度，并能区分ALP与类希格斯自旋-0态。
中文摘要 AI 辅助
轴子类粒子（ALPs）出现在许多动机良好的标准模型（SM）扩展中，并可通过高维算子与电弱规范玻色子（$V = W^\pm/ Z$）表现出特征相互作用。我们探讨了在HL-LHC上，在$\sqrt{s}=14~{\rm TeV}$和积分亮度$\mathcal{L}=3~{\rm ab}^{-1}$条件下，ALPs（$a$）与$V$的联合产生。我们研究了过程$pp\to Va$，其中$a\to\gamma\gamma$，针对ALP质量范围$20~{\rm GeV}\leq m_a\leq 200~{\rm GeV}$。该分析通过利用由动量依赖的$\rm {V-V-a}$相互作用引起的特征反冲和极化特征，扩展了现有的联合产生搜索。使用基于截断的选择和XGBoost多元分析，我们证明了这些可观测量在双光子质量峰之外对标准模型背景提供了稳健的区分，将电弱ALP耦合的灵敏度提高到$C_{WW} \gtrsim 5.6 \times 10^{-3}~\mathrm{TeV}^{-1}$和$C_{BB} \gtrsim 2.8\times 10^{-2}~\mathrm{TeV}^{-1}$。我们进一步表明，如果在数据中观察到共振峰，相同的可观测量可以帮助区分类ALP信号与相同质量的类希格斯自旋-0态。
英文摘要
Axion-like particles (ALPs) appear in many well-motivated extensions of the Standard Model (SM) and can exhibit characteristic interactions with electroweak gauge bosons ($V = W^\pm/ Z$) through higher-dimensional operators. We explore the production of ALPs ($a$) in association with $V$ at the HL-LHC, with $\sqrt{s}=14~{\rm TeV}$ and an integrated luminosity of $\mathcal{L}=3~{\rm ab}^{-1}$. We study the process $pp\to Va$, with $a\toγγ$, for ALP masses in the range $20~{\rm GeV}\leq m_a\leq 200~{\rm GeV}$. This analysis extends existing associated-production searches by exploiting characteristic recoil and polarization features induced by the momentum-dependent $\rm {V-V-a}$ interaction. Using both cut-based selections and an XGBoost multivariate analysis, we demonstrate that these observables provide robust discrimination against SM backgrounds beyond the diphoton mass peak, improving the sensitivity to electroweak ALP couplings to $C_{WW} \gtrsim 5.6 \times 10^{-3}~\mathrm{TeV}^{-1}$ and $C_{BB} \gtrsim 2.8\times 10^{-2}~\mathrm{TeV}^{-1}$. We further show that, if a resonance peak is observed in data, the same observables can help distinguish an ALP-like signal from a Higgs-like spin--0 state of the same mass.
发表机构
- SRM University-AP（SRM大学安得拉邦分校）
- Tata Institute of Fundamental Research（塔塔基础研究所）
- Monash University（莫纳什大学）
- Universitat de Barcelona（巴塞罗那大学）
机构由 AI 辅助整理，请以论文原文为准。
