Sea Quark Effects on Quarkonia
CP-PACS Collaboration: T. Manke, A. Ali Khan, S. Aoki, R. Burkhalter,, S. Ejiri, M. Fukugita, S. Hashimoto, N. Ishizuka, Y. Iwasaki, K. Kanaya, T., Kaneko, Y. Kuramashi, K. Nagai, M. Okawa, H.P. Shanahan, A. Ukawa, T. Yoshie
TL;DR
This paper investigates how two dynamical sea quarks influence the spectrum of heavy quarkonia using non-relativistic Lattice QCD, revealing significant effects on hyperfine splitting but not on fine structure, and analyzing scaling behavior across lattice spacings.
Contribution
It provides new insights into the impact of sea quarks on quarkonium spectra and examines the scaling behavior in lattice simulations.
Findings
Significant changes in hyperfine splitting due to sea quarks
No observable changes in fine structure from sea quarks
Scaling behavior analyzed across different lattice spacings
Abstract
We study the effects of two dynamical sea quarks on the spectrum of heavy quarkonia. Within the non-relativistic approach to Lattice QCD we found sizeable changes to the hyperfine splitting, but we could not observe any changes for the fine structure. We also investigated the scaling behaviour of our results for several different lattice spacings.
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