Bonn 2010 – wissenschaftliches Programm
T 12.4: Vortrag
Mittwoch, 17. März 2010, 14:45–15:00, HG XVI
Nucleon sum rules in next-to-leading order — •Michael Gruber and Vladimir Braun — Institut für Theoretische Physik, Universität Regensburg
To study nucleon properties one has to choose a suitable interpolating current for the proton. We consider the leading-twist (Chernyak-Zhitnitsky-) current and calculate next-to-leading order perturbative corrections. Using the framework of SVZ sum rules we can extract a new value for the nucleon wave function normalization constant fN and compare it with existing theoretical work and lattice data. Due to the radiative corrections the value for fN is expected to differ about 10% from previous sum rule calculations.