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2011

Axial couplings and strong decay widths of heavy hadrons

Detmold, William, Lin, C. -J. David, Meinel, Stefan

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We calculate the axial couplings of mesons and baryons containing a heavy quark in the static limit using lattice QCD.

These couplings determine the leading interactions in heavy hadron chiral perturbation theory and are central quantities in heavy quark physics, as they control strong decay widths and the light-quark mass dependence of heavy hadron observables.
Our analysis makes use of lattice data at six different pion masses, 227 MeV < m_\pi < 352 MeV, two lattice spacings, a=0.085, 0.112 fm, and a volume of (2.7 fm)^3.
Our results for the axial couplings are g_1=0.449(51), g_2=0.84(20), and g_3=0.71(13), where g_1 governs the interaction between heavy-light mesons and pions and g_{2,3} are similar couplings between heavy-light baryons and pions.

Axial couplings and strong decay widths of heavy hadrons · Around

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