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A comparison of spectral reconstruction methods applied to non-zero temperature NRQCD meson correlation functions
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We present results from the fastsum collaboration's programme to determine the spectrum of the bottomonium system as a function of temperature. Three different methods of extracting spectral information are discussed: a Maximum Likelihood approach using a Gaussian spectral function for the ground state, the Backus Gilbert method, and the Kernel Ridge Regression machine learning procedure. We employ the fastsum anisotropic lattices with 2+1 dynamical quark flavours, with temperatures ranging from 47 to 375 MeV.
Forward citations
Cited by 3 Pith papers
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Anisotropic excited bottomonia from a basis of smeared operators
Excited bottomonia masses and widths are extracted from lattice NRQCD using a smeared-operator GEVP, showing a width hierarchy and a slowly melting ground state.
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NRQCD Bottomonium at non-zero temperature using time-derivative moments
A time-derivative moment method applied to NRQCD lattice correlators extracts bottomonium masses and thermal widths, finding increasing width and decreasing mass with temperature.
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The NRQCD $\Upsilon$ spectrum at non-zero temperature using Backus-Gilbert regularisations
On FASTSUM Generation 2L ensembles, Backus-Gilbert and Tikhonov reconstructions agree on the Upsilon ground-state mass, but the decay width is dominated by reconstruction smearing and high-temperature broadening is un...
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