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Deuteron and exotic two-body bound states from lattice QCD
Beane, S. R. Chang, E. Parreno, A. Detmold, W. Orginos, K.
Beane, S. R.
Chang, E.
Parreno, A.
Detmold, W.
Orginos, K.
Abstract
Results of a high-statistics, multivolume lattice QCD exploration of the deuteron, the dineutron, the H-dibaryon, and the Xi(-)Xi(-) system at a pion mass of m(pi) similar to 390 MeV are presented. Calculations were performed with an anisotropic n(f) = 2 + 1 clover discretization in four lattice volumes of spatial extent L similar to 2.0, 2.5, 2.9, and 3.9 fm, with a lattice spacing of b(s) similar to 0.123 fm in the spatial direction and b(t) similar to b(s)/3.5 in the time direction. Using the results obtained in the largest two volumes, the Xi(-)Xi(-) is found to be bound by B(Xi-Xi-)0 = 14.0(1.4)(6.7) MeV, consistent with expectations based upon phenomenological models and low-energy effective field theories constrained by nucleon-nucleon and hyperon-nucleon scattering data at the physical light-quark masses. Further, we find that the deuteron and the dineutron have binding energies of B-d = 11(05)(12) MeV and B-nn = 7.1(5.2)(7.3) MeV, respectively. With an increased number of measurements and a refined analysis, the binding energy of the H-dibaryon is B-H = 13.2(1.8)(4.0) MeV at this pion mass, updating our previous result.
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2012-01-01
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Physics
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https://doi.org/10.1103/PhysRevD.85.054511