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Thermal Broadening of Bottomonia: Lattice Non-Relativistic QCD with Extended Operators
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abstract
We present lattice non-relativistic QCD calculations of bottomonium correlation functions at temperatures $T \simeq 150-350$ MeV. The correlation functions were computed using extended bottomonium operators, and on background gauge-field configurations for 2+1-flavor QCD having physical kaon and nearly-physical pion masses. We analyzed these correlation functions based on simple theoretically-motivated parameterizations of the corresponding spectral functions. The results of our analyses are compatible with significant in-medium thermal broadening of the ground state S- and P-wave bottomonia.
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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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