顶夸克偶素阴影中的新物理？
New physics in toponium's shadow?
AI总结：
研究在顶夸克偶素形成阈值附近，中性赝标量粒子如何通过有效理论修改顶夸克对产生率，并限制其参数空间。
摘要：
ATLAS和CMS最近报告了在阈值附近顶夸克对产生率的增强，该区域与顶夸克偶素形成相关的非微扰QCD动力学变得重要。我们使用一种有效描述，一致地包含微扰标准模型和新物理贡献、它们的干涉以及非微扰阈值效应，研究了这种行为在存在与胶子和顶夸克耦合的中性赝标量时如何被修改。我们表明，这些因素的组合效应显著塑造了赝标量参数空间的可行区域，特别是对于质量接近两倍顶夸克质量的窄共振。虽然标准模型阈值效应可以解释测量到的增强的相当大一部分，但当前数据仍然与来自赝标量相互作用的额外贡献兼容。
英文摘要：
ATLAS and CMS have recently reported enhancements in the top-antitop production rate near threshold, a region where non-perturbative QCD dynamics associated with toponium formation become relevant. We investigate how this behaviour is modified in the presence of a neutral pseudoscalar that couples to gluons and top quarks, using an effective description that consistently incorporates perturbative Standard Model and new physics contributions, their interference and non-perturbative threshold effects. We show that the combined effect of those ingredients markedly shapes the viable region of the pseudoscalar parameter space, particularly for narrow resonances with masses close to twice the top mass. While Standard Model threshold effects could explain a sizeable part of the measured enhancements, the current data remain compatible with additional contributions from pseudoscalar interactions.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
