HQET on the lattice. A non-perturbative computation of the b-quark mass

por Michele Della Morte (Humboldt-Universitaet zu Berlin)

miércoles 28 jun. 2006 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

Hadronic bound states of heavy quark constituents are characterized by a large separation of mass scales: the heavy quark mass scale is much larger than the scale \Lambda_{QCD} associated with the light degrees of freedom. HQET provides a tool to separate the physics associated with the two scales. The evaluation of amplitudes in HQET should be carried out at the non-perturbative level, while the matching to the full theory is in principle affected by short-distance physics only. In this context lattice field theory methods and non-perturbative renormalization techniques represent an invaluable tool to obtain precise theoretical predictions of quantities such as heavy quark masses or decay constants. We present a fully non-perturbative computation of the renormalization group invariant mass of the b-quark in the quenched approximation and including the terms of order \Lambda^2/mb.