Bonn 2010 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 26: Gittereichtheorie II

T 26.5: Vortrag

Dienstag, 16. März 2010, 17:45–18:00, HG XIII

Charm current-current correlators in twisted mass lattice QCD — •Marcus Petschlies — Institut für Physik, Humboldt-Universität zu Berlin

The charm quark mass and the strong coupling constant are two of the fundamental parameters of the Standard Model and the precision of their determination has been continuously enhanced by higher order perturbative QCD calculations combined with more precise experimental data from e⁺−e⁻−scattering as well as non-perturbative lattice calculations. As opposed to using experimental data to include non-perturbative effects, lattice QCD is not confined to the vector current correlator alone but additionally allows for an extension to the axial vector, scalar and pseudoscalar current correlators giving rise to a larger number of operators to extract the desired parameters from.

We study the moments of the diverse charm current-current correlators in the framework of twisted mass lattice QCD with two light dynamical quarks. By matching lattice QCD results to continuum perturbation theory the strong coupling constant and the charm quark mass are extracted and compared to QCD sum rule and previous lattice calculations. The talk will be given on behalf of the European Twisted Mass Collaboration.