Spectral reconstruction in NRQCD via the Backus-Gilbert method

Ben Page*, Gert Aarts, Chris Allton, Benjamin Jäger, Seyong Kim, Maria Paola Lombardo, Sam Offler, Sinead M. Ryan, Jon Ivar Skullerud, Thomas Spriggs

*Corresponding author for this work

Research output: Contribution to journalConference articleResearchpeer-review

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We present progress results from the Fastsum collaboration's programme to determine the spectrum of the bottomonium system as a function of temperature using a variety of approaches. In this contribution, the Backus-Gilbert method is used to reconstruct spectral functions from NRQCD meson correlator data from Fastsum's anisotropic ensembles at nonzero temperature. We focus in particular on the resolving power of the method, providing a demonstration of how the underlying resolution functions can be probed by exploiting the Laplacian nature of the NRQCD kernel. We conclude with estimates of the bottomonium ground state mass and widths at nonzero temperature.

Original languageEnglish
Article number134
JournalProceedings of Science
Publication statusPublished - 8. Jul 2022
Event38th International Symposium on Lattice Field Theory, LATTICE 2021 - Virtual, Online, United States
Duration: 26. Jul 202130. Jul 2021


Conference38th International Symposium on Lattice Field Theory, LATTICE 2021
Country/TerritoryUnited States
CityVirtual, Online


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