Strangeness S=-2 baryon-baryon interactions and femtoscopic correlation functions in covariant chiral effective field theory  

作　　者：刘志伟 李凯文 耿立升 Zhi-Wei Liu;Kai-Wen Li;Li-Sheng Geng(School of Physics,Beihang University,Beijing 102206,China;Medical Management Department,CAS Ion Medical Technology Co.,Ltd.,Beijing 100190,China;Beijing Advanced Innovation Center for Big Data-Based Precision Medicine,School of Medicine and Engineering,Beihang University,Key Laboratory of Big Data-Based Precision Medicine(Beihang University),Ministry of Industry and Information Technology,Beijing 100191,China;Beijing Key Laboratory of Advanced Nuclear Materials and Physics,Beihang University,Beijing 102206,China;School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]School of Physics,Beihang University,Beijing 102206,China [2]Medical Management Department,CAS Ion Medical Technology Co.,Ltd.,Beijing 100190,China [3]Beijing Advanced Innovation Center for Big Data-Based Precision Medicine,School of Medicine and Engineering,Beihang University,Key Laboratory of Big Data-Based Precision Medicine(Beihang University),Ministry of Industry and Information Technology,Beijing 100191,China [4]Beijing Key Laboratory of Advanced Nuclear Materials and Physics,Beihang University,Beijing 102206,China [5]School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Chinese Physics C》2023年第2期174-189,共16页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China (11735003, 11975041, 11961141004)。

摘　　要：We study the baryon-baryon interactions with strangeness S=-2 and corresponding momentum correlation functions in leading order covariant chiral effective field theory.The relevant low energy constants are determined by fitting to the latest HAL QCD simulations,taking into account all the coupled channels.Extrapolating the so-obtained strong interactions to the physical point and considering both quantum statistical effects and the Coulomb interaction,we calculate the ΛΛ and Ξ^(-)p correlation functions with a spherical Gaussian source and compare them with recent experimental data.We find a good agreement between our predictions and the experimental measurements by using the source radius determined in proton-proton correlations,which demonstrates the consistency between theory,experiment,and lattice QCD simulations.Moreover,we predict the Σ^(+)Σ^(+),Σ^(+)Λ,and Σ^(+)Σ^(-) interactions and corresponding momentum correlation functions.We further investigate the influence of the source shape and size of the hadron pair on the correlation functions studied and show that the current data are not very sensitive to the source shape.Future experimental measurements of the predicted momentum correlation functions will provide a non-trivial test of not only SU(3) flavor symmetry and its breaking but also the baryon-baryon interactions derived in covariant chiral effective field theory.

关 键 词：covariant chiral effective field theory momentum correlation functions baryon-baryon interactions 

分 类 号：O572.34[理学—粒子物理与原子核物理]