I=1/2 low-lying mesons in lattice QCD  

作　　者：傅子文 

机构地区：[1]Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education [2]Institute of Nuclear Science and Technology, College of Physical Science and Technology, Sichuan University

出　　处：《Chinese Physics C》2015年第8期8-14,共7页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11175124);National Magnetic Confinement Fusion Program of China(2013GB109000)

摘　　要：Using a conventional constituent-quark model, I = 1/2 scalar K, vector K＊（892）, and axial vector K1 mesons are studied in the asqtad-improved staggered fermion with wall-source and point-sink interpolators. The mass ratio of mK/mz＊（892） is numerically confirmed to apparently vary with quark mass, and the experimental ordering mK.（892） 〉 mK holds elegantly when the light u/d quark masses are sufficiently small, while the valence strange quark mass is fixed to its physical value. We also get reasonable signals for the K1 meson suggested by the SCALAR Collaboration from lattice QCD. The computations are conducted with the MILC Nf=3 flavor gauge configurations at three lattice spacings： a≈0.15, 0.12, and 0.09 fm.Using a conventional constituent-quark model, I = 1/2 scalar K, vector K＊（892）, and axial vector K1 mesons are studied in the asqtad-improved staggered fermion with wall-source and point-sink interpolators. The mass ratio of mK/mz＊（892） is numerically confirmed to apparently vary with quark mass, and the experimental ordering mK.（892） 〉 mK holds elegantly when the light u/d quark masses are sufficiently small, while the valence strange quark mass is fixed to its physical value. We also get reasonable signals for the K1 meson suggested by the SCALAR Collaboration from lattice QCD. The computations are conducted with the MILC Nf=3 flavor gauge configurations at three lattice spacings： a≈0.15, 0.12, and 0.09 fm.

关 键 词：scalar meson vector meson axial vector meson 

分 类 号：O572.33[理学—粒子物理与原子核物理] TU992.03[理学—物理]