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arXiv 2603.01037hep-phhep-ex
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重子光谱学中的夸克-双夸克有效质量形式化

Quark-diquark effective mass formalism for heavy baryon spectroscopy

SRM Institute of Science and Technology(SRM科学与技术学院)

Binesh Mohan, Rohit Dhir

AI总结:

本文提出一种用于重味重子光谱学的夸克-双夸克有效质量形式化,分析了不同重味区域的1/2+和3/2+谱,并通过两种互补场景提取了构成夸克质量、有效双夸克质量和色磁耦合常数。

摘要:

我们开发了一种用于重味重子光谱学的夸克-双夸克有效质量形式化,并将其应用于J^P=1/2+和J^P=3/2+谱,涵盖了单重、双重和三重重子区域。分析通过两种互补场景进行:场景I动态处理所有夸克-双夸克通道,而场景II限制动态到标量和轴向向量双夸克,提供更选择性和物理透明的描述。构成夸克质量、有效双夸克质量和色磁耦合常数从已知的重子质量中提取,耦合常数仅由每个状态的夸克内容决定,不引入依赖于特定区域的调整。实现了一个依赖于质量的结合项,以考虑与自旋无关的色电效应,并描述从色磁主导到色库仑主导的转变,确保在重夸克极限下与重夸克自旋对称性一致。所得预测与可用的实验测量和格点QCD结果在charm和bottom区域均良好一致。提取的双夸克参数在所有重味区域保持稳定,确立了当前框架作为重子结构对称约束光谱学的基础。

英文摘要:

We develop a quark-diquark effective mass formalism for heavy-flavor baryon spectroscopy and apply it to the $J^P = \tfrac{1}{2}^+$ and $J^P = \tfrac{3}{2}^+$ spectra across the singly, doubly, and triply heavy sectors. The analysis is carried out in two complementary scenarios: Scenario I treats all quark-quark diquark channels dynamically, while Scenario II restricts the dynamics to scalar and axial-vector diquarks, providing a more selective and physically transparent description. Constituent quark masses, effective diquark masses, and chromomagnetic couplings are extracted from known heavy-baryon masses, with the couplings determined solely by the quark content of each state and no sector-dependent adjustment introduced. A mass-dependent binding term is implemented to account for spin-independent chromoelectric effects and to describe the transition from chromomagnetic to color-Coulomb dominance across the light-to-heavy quark regime, ensuring consistency with heavy-quark spin symmetry in the heavy-quark limit. The resulting predictions are in good agreement with available experimental measurements and lattice QCD results across both charm and bottom sectors. The extracted diquark parameters remain stable across all heavy-flavor sectors, establishing the present framework as a symmetry-constrained spectroscopic baseline for heavy-baryon structure.

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