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Sea Quark Effects on Quarkonia

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arxiv hep-lat/0005022 v2 pith:TMJ2RMIR submitted 2000-05-26 hep-lat

CP-PACS Collaboration: T. Manke , A. Ali Khan , S. Aoki , R. Burkhalter , S. Ejiri , M. Fukugita , S. Hashimoto , N. Ishizuka
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Y. Iwasaki K. Kanaya T. Kaneko Y. Kuramashi K. Nagai M. Okawa H.P. Shanahan A. Ukawa T. Yoshie
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keywords changeseffectslatticequarkoniaapproachbehaviourdifferentdynamical
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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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  1. Lattice QCD determination of the radiative decay rates $h_{c}\to \eta_{c}\, \gamma$ and $h_{b}\to \eta_{b}\, \gamma$

    hep-lat 2025-04 conditional novelty 7.0 of 10

    Using five lattice spacings with physical quark masses, the authors obtain Gamma(h_c->eta_c gamma)=0.604(24) MeV and the first lattice QCD estimate Gamma(h_b->eta_b gamma)=46.0(4.8) keV.

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