Volume 128, Number 1, October 2019
|Number of page(s)||7|
|Section||The Physics of Elementary Particles and Fields|
|Published online||27 November 2019|
Ground-state mass in short lattices by controlling overconfidence and bias in Bayesian fits
1 Department of Theoretical Physics, Tata Institute of Fundamental Research - Homi Bhabha Road, Mumbai 400005, India
2 Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany
Received: 11 July 2019
Accepted: 8 October 2019
We investigate the seemingly ill-defined problem of extracting a ground-state mass from a lattice simulation where the extent of the lattice is not long enough to project out the ground-state properly. We regulate the problem using a Bayesian method. We show that controlling meta-parameters (overconfidence) can allow the data to overcome the input priors (bias). We can write the method as a black-box technique which allows extraction of a ground-state mass, even on a relatively short lattice.
PACS: 11.15.Ha – Lattice gauge theory / 02.50.Tt – Inference methods / 12.38.Gc – Lattice QCD calculations
© EPLA, 2019
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