A progress in inverse matrix method in QCD sum rules

Autor:	Zhao, Zhen-Xing, Xing, Yi-Peng, Li, Run-Hui
Rok vydání:	2024
Předmět:	High Energy Physics - Phenomenology
Druh dokumentu:	Working Paper
Popis:	In traditional QCD sum rules, the simple hadron spectral density model of ``delta-function-type ground state + theta-function-type continuous spectrum" determines that there is no perfect parameter selection. In recent years, inverse problem methods, especially the inverse matrix method, have shown better handling of QCD sum rules. This work continues to develop the inverse matrix method. Considering that the narrow-width approximation may still be a good approximation, we separate the contribution of the ground state from the spectral density. Then follow the general steps of the inverse matrix method to extract physical quantities such as decay constants that we are sometimes more interested in. Comment: 13 pages, 6 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2407.09819 Zobrazit plný text záznamu View this record from Arxiv