Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-09-29
PoS LATTICE2008:133,2008
Physics
High Energy Physics
High Energy Physics - Lattice
7 pages, 7 figures, talk presented at the XXVI International Symposium on Lattice Field Theory, July 14-19, 2008, Williamsburg
Scientific paper
In calculations of the hyperfine splitting in charmonium, the contributions of the disconnected diagrams is considered small and is typically ignored. We aim to estimate nonperturbatively the size of the resulting error, which could potentially affect the high precision calculations of the charmonium spectrum. Following our work on the effects of the disconnected diagrams in unquenched QCD presented at Lattice 2007, we study the same problem in the quenched case. On dynamical ensembles the disconnected charmonium propagators contain light modes which complicate the extraction of the signal at large distances. In the fully quenched case, where there are no such light modes, the interpretation of the signal is simplified. We present results from lattices with $a\approx 0.09$ fm and $a\approx 0.063$ fm.
DeTar Carleton
Levkova Ludmila
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