Analysis of the 1S and 2S states of AQ and ΘQ with QCD sum rules

• 作 者: Zhi-Gang Wang Hui-Juan Wang
• 机 构: Department of Physics, North China Electric Power University, Baoding 071003, China
• 出 处: 中国物理C（英文版）
• 发表日期: 2021年1期
• 关键词: heavy baryon states QCD sum rules

In this article,we study the ground states and the first radial excited states of the flavor antitriplet heavy baryon states AQ and ΘQ with the spin-parity JP =1/2+by carrying out operator product expansion up to vacuum condensates of dimension 10 in a consistent way.We observe for the first time that the higher dimensional vacuum condensates play an important role,and obtain very stable QCD sum rules with variations of the Borel parameters for the heavy baryon states.The predicted masses 6.08 ±0.09GeV,2.78±0.08GeV,and 2.96±0.09GeV for the first radial excited states Ab(2S),Ac(2S),and Θc(2S),respectively,are in excellent agreement with the experiment-al data and support assigning Ab(6072),Ac(2765),and Θc(2980/2970)to be the first radial excited states of Ab,Ac,and Θc,respectively.The predicted mass 6.24±0.07 GeV for Θb(2S)can be confirmed using experimental data in the future.