On the B*' --> B transition

Abstract

We present a first Nf=2 lattice estimate of the hadronic coupling g_12 which parametrises the strong decay of a radially excited B* meson into the ground state B meson at zero recoil. We work in the static limit of Heavy Quark Effective Theory (HQET) and solve a Generalised Eigenvalue Problem (GEVP), which is necessary for the extraction of excited state properties. After an extrapolation to the continuum limit and a check of the pion mass dependence, we obtain g_12 = -0.17(4).

13 pages, 8 figures, published version

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• Transition of $\rho \to \pi \gamma$ in Lattice QCD
• Pion couplings to the scalar B meson
• Density distributions in the $B$ meson
• Unexpected pattern of transitions to radial excitations by heavy quark current