The gluonic condensate from the hyperfine splitting M cog(XcJ) — M(h c) in charmonium
نویسندگان
چکیده
منابع مشابه
Contribution of charm anihilation to the hyperfine splitting in charmonium in the quenched case
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 pres...
متن کاملThe Hyperfine Splitting in Charmonium: Lattice Computations using the Wilson and Clover Fermion Actions
We compute the hyperfine splitting mJ/ψ − mηc on the lattice, using both the Wilson and O(a)-improved (clover) actions for quenched quarks. The computations are performed on a 243×48 lattice at β = 6.2, using the same set of 18 gluon configurations for both fermion actions. We find that the splitting is 1.83 + 13 − 15 times larger with the clover action than with the Wilson action, demonstratin...
متن کاملEffects of the disconnected flavor singlet corrections on the hyperfine splitting in charmonium
Experimentally the charmonium hyperfine splitting is MJ/ψ −Mηc = 117 MeV and current lattice results are generally below this value. The difference could be due to the effects of the disconnected flavor singlet diagrams which have not been included in these calculations. Previous attempts to determine the disconnected flavor singlet corrections have led just to rough estimates in the range of ±...
متن کاملGluonic excitation of non-exotic hybrid charmonium from lattice QCD
The ground and first excited states of the hybrid charmonium c̄cg, with non-exotic quantum numbers J = 0, 1−− and 1 are investigated using quenched lattice QCD. They are completely ignored in the literature, only because their ground states are degenerate with ηc, J/ψ, and χc1, and are difficult to be distinguished from these conventional charmonium mesons in experiment. However, we observe stro...
متن کاملThe spectrum of radial, orbital and gluonic excitations of charmonium
We present results for the charmonium spectrum from N f = 2 dynamical QCD simulations on 12 3 × 80 anisotropic lattices. Using all-to-all propagators we determine the ground and excited states of S, P and D waves and hybrids. We also evaluate the disconnected (OZI suppressed) contribution to the η c and J/Ψ.
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ژورنال
عنوان ژورنال: Physics of Atomic Nuclei
سال: 2006
ISSN: 1063-7788,1562-692X
DOI: 10.1134/s106377880604017x