Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 56: Hadron Structure and Spectroscopy I
HK 56.8: Talk
Wednesday, March 18, 2009, 18:30–18:45, H-ZO 20
Spectroscopy of hadron resonances on the lattice — Gunnar Bali1, Tommy Burch1, Christian Ehmann1, Christof Gattringer2, Meinulf Göckeler1, •Christian Hagen1, Christian Lang2, Markus Limmer2, Daniel Mohler2, and Andreas Schäfer1 — 1Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany — 2Institut für Physik, FB Theoretische Physik, Universität Graz, A-8010 Graz, Austria
The reproduction of the hadron mass spectrum from first principles is an important task for lattice QCD. While ground state spectroscopy, especially in the quenched approximation, is by now well understood, a clean extraction of excited hadron masses from a lattice QCD simulation still is a serious challenge. We discuss the relevant techniques for spectroscopy calculations on the lattice, in particular the variational technique which is needed for separating the different excited states from the ground state. Using this method we study three different sectors of the hadron spectrum. In the light quark sector we present hadron masses obtained from simulations with dynamical approximately chiral fermions, so-called Chirally Improved Fermions. For charmonium, we are able to extract masses for a number of excited states including ones with higher spin and exotic quantum numbers. The heavy-light hadron sector is investigated in the static-light approximation, i.e., the heavy quark is treated as infinitely heavy. Also here we are able to determine a large number of excitations.