Key Laboratory of Radiation Physics and Technology (Ministry of Education), Sichuan University, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064
Lattice QCD Study of the σ Meson
FU Zi-Wen**
Key Laboratory of Radiation Physics and Technology (Ministry of Education), Sichuan University, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064
摘要We study the σ meson in 2+1 flavor full quantum chromodynamics (QCD) with sufficiently light u and d quarks. The point−to-point correlator is measured for the σ channel in the “Asqtad” improved staggered fermion formulation. Particular attention is paid to its disconnected diagram and bubble contribution. After chiral extrapolation, we obtain the σ mass with 706±53 MeV, which is close to the observed σ meson within error, and is heavier than the ππ threshold. The simulations are carried out with MILC 2+1 flavor gauge configurations at lattice spacing of a≈0.15 fm.
Abstract：We study the σ meson in 2+1 flavor full quantum chromodynamics (QCD) with sufficiently light u and d quarks. The point−to-point correlator is measured for the σ channel in the “Asqtad” improved staggered fermion formulation. Particular attention is paid to its disconnected diagram and bubble contribution. After chiral extrapolation, we obtain the σ mass with 706±53 MeV, which is close to the observed σ meson within error, and is heavier than the ππ threshold. The simulations are carried out with MILC 2+1 flavor gauge configurations at lattice spacing of a≈0.15 fm.
FU Zi-Wen**
. Lattice QCD Study of the σ Meson[J]. 中国物理快报, 2011, 28(8): 81202-081202.
FU Zi-Wen**
. Lattice QCD Study of the σ Meson. Chin. Phys. Lett., 2011, 28(8): 81202-081202.
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