近日，西班牙韦尔瓦大学的Yin-Zhen Xu及其研究团队取得一项新进展。经过不懈努力，他们对重-轻赝标量和矢量介子的电磁形状因子进行了研究。相关研究成果已于2024年7月12日在国际知名学术期刊《高能物理杂志》上发表。

本文首次在Dyson-Schwinger/Bethe-Salpeter方程框架内，系统地研究了重-轻赝标量介子和矢量介子的电磁形状因子。结果表明，矢量介子的电荷半径比其赝标量介子的电荷半径大。在重-轻体系中，味对称性破缺会导致不同夸克的形状因子分裂，轻夸克和重夸克的分布范围分别逐渐扩大和缩小。

它们之间的相互竞争产生了介子的电磁形态因子。这项研究结果可以与其他理论计算和未来的实验数据进行比较。

附：英文原文

Title: The electromagnetic form factors of heavy-light pseudo-scalar and vector mesons

Author: Xu, Yin-Zhen

Issue&Volume: 2024-07-12

Abstract: We systematically investigate the electromagnetic form factors of heavy-light pseudo-scalar and vector mesons within the Dyson-Schwinger/Bethe-Salpeter equations framework for the first time. It is found that the charge radius of vector meson is larger than that of its pseudo-scalar counterpart. In heavy-light systems, the flavor symmetry breaking will lead to a splitting of the form factor of different quark, and the distribution range of lighter and heavier quark gradually expands and contracts, respectively. The competition between them together generates the electromagnetic form factors of meson. Our results can be compared with other theoretical calculations and future experimental data.

DOI: 10.1007/JHEP07(2024)118

Source: https://link.springer.com/article/10.1007/JHEP07(2024)118