München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 25: Quantenfeldtheorie

T 25.8: Group Report

Friday, March 13, 2009, 15:50–16:10, M010

Diquark correlations in baryon spectroscopy and holographic QCD — •Hilmar Forkel¹ and Eberhard Klempt² — ¹Institut für Physik, Humboldt-Universität zu Berlin, Germany — ²Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Germany

We improve upon recent holographic predictions for the nucleon and delta resonance spectra and show how they emerge from a straightforward extension of the ``metric soft wall'' AdS/QCD dual. The resulting mass formula depends on a single adjustable parameter, characterizing confinement-induced IR deformations of the anti-de Sitter metric, and on the fraction of ``good'' (i.e. maximally attractive) diquarks in the baryon's quark model wave function. Despite their remarkable simplicity, the predicted spectra describe the masses of all 48 observed light-quark baryon states and the underlying, linear trajectory structure with unprecedented accuracy.