Fast Fits for Lattice QCD Correlators
K. Hornbostel, G. P. Lepage, C. T. H. Davies, R. J. Dowdall, H. Na, J., Shigemitsu
TL;DR
The paper presents a new technique for fitting lattice QCD correlators to sums of exponentials that is 10-40 times faster than traditional methods, demonstrated on Upsilon spectrum and D -> pi form factor analyses.
Contribution
It introduces a significantly faster fitting method for lattice QCD correlators, simplifying effective-mass analyses for single correlators.
Findings
Fitting speed improved by 10-40 times
Applied to Upsilon spectrum analysis
Applied to D -> pi semileptonic form factor
Abstract
We illustrate a technique for fitting lattice QCD correlators to sums of exponentials that is significantly faster than traditional fitting methods --- 10--40 times faster for the realistic examples we present. Our examples are drawn from a recent analysis of the Upsilon spectrum, and another recent analysis of the D -> pi semileptonic form factor. For single correlators, we show how to simplify traditional effective-mass analyses.
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