Scalar Mesons a0(1450) and sigma(600) from Lattice QCD

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dc.creatorMathur, Nilmani
dc.creatorAlexandru, A.
dc.creatorChen, Y.
dc.creatorDong, S. J.
dc.creatorDraper, T.
dc.creatorHorvath, I.
dc.creatorLee, F. X.
dc.creatorLiu, K. F.
dc.creatorTamhankar, S.
dc.creatorZhang, J. B.
dc.date2006-07-10
dc.date2007-10-04
dc.date.accessioned2026-07-07T11:27:02Z
dc.date.available2026-07-07T11:27:02Z
dc.descriptionWe study the a0 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'pi ghost states are separated, we find that the a0 mass with q\bar{q} 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 a0(1450) being the u\bar{d} meson and K0*(1430) being the u\bar{s} 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 around 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.
dc.description11 pages, 9 figures, accepted for publication in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/hep-ph/0607110
dc.identifierhttp://arxiv.org/abs/hep-ph/0607110
dc.identifierPhys.Rev.D76:114505,2007
dc.identifierdoi:10.1103/PhysRevD.76.114505
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196022
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Lattice
dc.subjectNuclear Theory
dc.titleScalar Mesons a0(1450) and sigma(600) from Lattice QCD
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