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- W4287258840 abstract "The estimation of the Kall'en-Lehmann spectral density from gauge invariant lattice QCD two point correlation functions is proposed, and explored via an appropriate inversion method. As proof of concept the SU(2) glueball spectrum for the quantum numbers $J^{PC} = 0^{++}$ is investigated for various values of the lattice spacing. The spectral density and the glueball spectrum are estimated using the published data of arXiv:1910.07756. Our estimates for the ground state mass are in good agreement with the traditional approach published therein, which is based on the large time exponential behaviour of the correlation functions. Furthermore, the spectral density also contains hints of excites states in the spectrum." @default.
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- W4287258840 date "2022-03-01" @default.
- W4287258840 modified "2023-10-17" @default.
- W4287258840 title "Källén–Lehmann spectral representation of the scalar SU(2) glueball" @default.
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- W4287258840 doi "https://doi.org/10.1140/epjc/s10052-022-10213-3" @default.
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