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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 Υ spectrum, and another recent analysis of the D→π semileptonic form factor. For single correlators, we show how to simplify traditional effective-mass analyses.
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Hornbostel et al. (2012) studied this question.
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