Café com Física
03 de abril de 2013
Deutsches Elektronen-Synchrotron (DESY)
Strong coupling and strange quark mass from lattice QCD (.pdf)
We give an introduction to an advanced technique for a lattice computation of the strong coupling constant at high energies. A recent computation is discussed, including the determination of the the mass of the strange quark in 2-flavor QCD. Discretization errors of the lattice results are removed by careful continuum extrapolations and perturbation theory is used only where alpha is approximately equal to 0.1. We discuss further improvements which will reduce the uncertainties considerably.