arXiv 2508.034222025-08hep-ph

重夸克有效理论框架下顶介子的QCD求和规则研究

QCD sum rule study of topped mesons within heavy quark effective theory

Shu-Wei Zhang, Xuan Luo, Hui-Min Yang, Hua-Xing Chen

备注：: 8 pages, 3 figures, 1 table, revised version to be published in the journal Universe
发表信息：: Universe 11 (2025) 10, 334
DOI：: 10.3390/universe11100334

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AI总结：

受CMS近阈增强观测启发，本研究在重夸克有效理论框架下利用QCD求和规则研究了顶介子的结构与质量谱，预测其质量约为173.1 GeV，比顶夸克极点质量高约0.5-0.6 GeV。

摘要：

受近期CMS对顶夸克对产生中近阈增强现象的观测启发，我们研究了一类包含单个顶夸克的全新强子系统：顶介子（$t\ar{q}$，其中$\ar q = \ar u, \ar d, \ar s$）。与主要在微扰QCD框架内广泛研究的顶偶素（$t\ar{t}$）系统不同，顶介子为重夸克极限下的QCD动力学提供了互补的非微扰探针。由于仅单个顶夸克发生弱衰变，预期这些态具有比顶偶素更长的寿命和更窄的衰变宽度。我们在重夸克有效理论框架下采用QCD求和规则研究了基态顶介子的结构和质量谱。我们的分析预测其质量约为173.1 GeV，比顶夸克极点质量高出约0.5-0.6 GeV。与[arXiv:2507.05895]中同期研究的单顶重子（$tqq$，其中$q = u, d, s$）相比，顶介子夸克组成更简单，衰变道更有利（预期顶介子弱衰变为$Υ$介子和粲介子），增强了其在理论分析与实验发现方面的潜力。

英文摘要：

Motivated by the recent CMS observation of a near-threshold enhancement in top quark pair production, we investigate a novel class of hadronic systems containing a single top quark: the topped mesons ($t\bar{q}$, with $\bar q = \bar u, \bar d, \bar s$). In contrast to the extensively studied toponium ($t\bar{t}$) system, analyzed primarily within perturbative QCD, topped mesons offer a complementary nonperturbative probe of QCD dynamics in the heavy quark limit. These states are expected to exhibit longer lifetimes and narrower decay widths than toponium, as only a single top quark undergoes weak decay. We employ QCD sum rules within the framework of heavy quark effective theory to study the structure and mass spectrum of ground-state topped mesons. Our analysis predicts masses near 173.1 GeV, approximately 0.5-0.6 GeV above the top quark pole mass. Compared with singly topped baryons ($tqq$, with $q = u, d, s$) studied concurrently in [arXiv:2507.05895], topped mesons have a simpler quark composition and more favorable decay channels (a topped meson is anticipated to decay weakly into a $Υ$ meson and a charmed meson), enhancing their potential for both theoretical analysis and experimental discovery.

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。

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