Confronting QCD with hadronic data: test of QCD and extraction of the light quark masses

por Cesareo A. Dominguez (Centre for Theoretical Physics & Astrophysics, University of Cape Town , Department of Physics, Stellenbosch University)

martes 19 may. 2009 12:30 → 13:30 Europe/Madrid

Sala Seminarios (Dpto. de Física Teórica (UVEG))

Experimental data from the ALEPH collaboration on hadronic decays of the tau-lepton, in the vector and the axial-vector channels, is confronted with QCD in the framework of Finite Energy Sum Rules (FESR). These involve a polynomial integration kernel tuned to suppress the region beyond the kinematical end-point where there is no longer data. An analogue approach is used to extract the values of the light (up-, down-, and strange-) quark masses, where the polynomial integration kernel is chosen so as to minimize systematic uncertainties due to the lack of direct experimental data on the relevant hadronic spectral functions.