Accurate QCD parameter determination

Abstract

The precise knowledge of fundamental Quantum Chromodynamics (QCD) parameters is essential to precision calculations in particle physics. Several of them can be determined through the sound theoretical description" of decays tau u → hadrons + nu_tau combined with experimental data obtained at LEP (CERN). In 2014, the group responsible for the ALEPH data published a re-analysis of the data for tau u → hadrons + nu_tau. The first goal of this research project is a new determination of alpha_s - the strong coupling - that combines the recent theoretical developments with the data sets from ALEPH and OPAL collaborations. Other aspects of the theoretical description will also be assessed, e.g., low-energy constants, the contribution of condensates, and violations of quark-hadron duality. In our work, it will also be important to investigate more fundamental theoretical aspects of perturbative QCD, such as the use of the renormalization group. In parallel, another research subject that can be explored is the anomalous Higgs couplings in the context of the dimension 6 effective Lagrangian. (AU)