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


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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.

TidsskriftProceedings of Science
StatusUdgivet - 8. jul. 2022
Begivenhed38th International Symposium on Lattice Field Theory, LATTICE 2021 - Virtual, Online, USA
Varighed: 26. jul. 202130. jul. 2021


Konference38th International Symposium on Lattice Field Theory, LATTICE 2021
ByVirtual, Online

Bibliografisk note

Funding Information:
This work is supported by STFC grant ST/T000813/1. SK is supported by the National Research Foundation of Korea under grant NRF-2021R1A2C1092701 funded by the Korean government (MEST). BP has been supported by a Swansea University Research Excellence Scholarship (SURES). This work used the DiRAC Extreme Scaling service at the University of Edinburgh, operated by the Edinburgh Parallel Computing Centre on behalf of the STFC DiRAC HPC Facility (www.dirac.ac.uk). This equipment was funded by BEIS capital funding via STFC capital grant ST/R00238X/1 and STFC DiRAC Operations grant ST/R001006/1. DiRAC is part of the National e-Infrastructure. This work was performed using PRACE resources at Cineca via grants 2015133079 and 2018194714. We acknowledge the support of the Supercomputing Wales project, which is part-funded by the European Regional Development Fund (ERDF) via Welsh Government, and the University of Southern Denmark for use of computing facilities. We are grateful to the Hadron Spectrum Collaboration for the use of their zero temperature ensemble.

Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)


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