| THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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Lattice QCD Study of the σ Meson |
| FU Zi-Wen**
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Key Laboratory of Radiation Physics and Technology (Ministry of Education), Sichuan University, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064
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| Cite this article: |
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FU Zi-Wen 2011 Chin. Phys. Lett. 28 081202 |
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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.
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| Keywords:
12.38.Gc
11.15.Ha
12.40.Yx
14.40.Df
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Received: 02 May 2011
Published: 28 July 2011
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| PACS: |
12.38.Gc
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(Lattice QCD calculations)
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11.15.Ha
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(Lattice gauge theory)
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12.40.Yx
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(Hadron mass models and calculations)
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14.40.Df
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(Strange mesons (|S|>0, C=B=0))
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