Lattice QCD study of the scalar mesons a{sub 0}(1450) and {sigma}(600)
- Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606 (United States)
- Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)
- Institute of High Energy Physics, Beijing 100039 (China)
- Department of Physics, George Washington University, Washington, D.C. 20052 (United States)
- Department of Physics, Hamline University, St. Paul, Minnesota 55104 (United States)
- Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310027 (China)
We study the a{sub 0} and {sigma} mesons with the overlap fermion in the chiral regime with the pion mass as low as 182 MeV in the quenched approximation. After the {eta}{sup '}{pi} ghost states are separated, we find the a{sub 0} mass with the qq interpolation field to be almost independent of the quark mass in the region below the strange quark mass. The chirally extrapolated results are consistent with a{sub 0}(1450) being the ud meson and K{sub 0}*(1430) being the us meson with calculated masses at 1.42{+-}0.13 GeV and 1.41{+-}0.12 GeV, respectively. We also calculate the scalar mesonium with a tetraquark interpolation field. In addition to the two-pion scattering states, we find a state at {approx}550 MeV. Through the study of volume dependence, we confirm that this state is a one-particle state, in contrast to the two-pion scattering states. This suggests that the observed state is a tetraquark mesonium which is quite possibly the {sigma}(600) meson.
- OSTI ID:
- 21023935
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 76, Issue 11; Other Information: DOI: 10.1103/PhysRevD.76.114505; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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