Please read these instructions before posting any event on Fermilab Indico

Indico will be unavailable due to server patching on Wed , June 19th, 7 a.m. to 7:30 a.m. Central Time

Jul 22 – 28, 2018
Kellogg Hotel and Conference Center
EST timezone

Multilevel integration for meson propagators

Jul 23, 2018, 3:00 PM
103 (Kellogg Hotel and Conference Center)


Kellogg Hotel and Conference Center

219 S Harrison Rd, East Lansing, MI 48824
Algorithms and Machines Algorithms and Machines


Dr Alessandro Nada (DESY Zeuthen)


The computation of hadronic correlation functions in lattice QCD is severely hindered by a signal-to-noise ratio that exponentially decreases with the distance between source and sink. Recent developments for the factorization of both the fermion propagator and the fermion determinant pave the way for the implementation of multilevel Monte Carlo integration techniques, which are already known to provide a solution to this problem in pure gauge theory. In this talk, we discuss a novel strategy to compute the leading factorized contribution to connected meson propagators based on noise sources. Finally, results for vector and scalar meson propagators obtained using this technique will be presented and their numerical effectiveness will be compared to that of a standard Monte Carlo simulation.

Primary authors

Dr Alessandro Nada (DESY Zeuthen) Prof. Leonardo Giusti (Universita' di Milano-Bicocca and INFN, sezione di Milano-Bicocca) Dr Stefan Schaefer (DESY Zeuthen) Dr Tim Harris (Milano Bicocca)

Presentation materials