Bonn 2010 – wissenschaftliches Programm
HK 43.2: Gruppenbericht
Donnerstag, 18. März 2010, 14:30–15:00, HG III
Effects of charmed meson loops in charmonium physics — •Feng-Kun Guo1, Christoph Hanhart1,2, and Ulf-G. Meißner1,2,3 — 1Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany — 2Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany — 3HISKP and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany
We investigate the effects of the charmed meson loops in both the transitions and spectroscopy of the charmonia. Using the technique of the nonrelativistic effective field theory, we show that the virtual charmed meson loops can be significantly large in the pion (η) emitting transitions between charmonia. The Y(4660) and its spin multiplet partner as the ψ′f0(980) and ηc′f0(980) bound states, which could be consequences of nonperturbative charmed meson loops, are also discussed.