Using extended operators, lattice NRQCD correlators at T=151-334 MeV are fit with broadened spectral functions, yielding thermal widths for bottomonia that grow with temperature, especially for P-waves.
Free-form smearing for bottomonium and B meson spectroscopy
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abstract
To obtain high-quality results from lattice QCD, it is important to use operators that produce good signals for the quantities of interest. Free-form smearing is a powerful tool that helps to accomplish that goal. The present work introduces a new implementation of free-form smearing that maintains its usefulness and reduces its computational time dramatically. Applications to the mass spectrum of $B$, $B_s$, $B_c$ and bottomonium mesons show the effectiveness of the method. Results are compared with other lattice QCD studies and with experimental data where available. The present work includes the first lattice QCD exploration for some of these mesons.
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Thermal Broadening of Bottomonia: Lattice Non-Relativistic QCD with Extended Operators
Using extended operators, lattice NRQCD correlators at T=151-334 MeV are fit with broadened spectral functions, yielding thermal widths for bottomonia that grow with temperature, especially for P-waves.