Low Mode Average (LMA) is a technique to improve the quality of the signal-to-noise ratio in the long time separation of Euclidean correlation functions. We report on its beneficial impact in computing the vector-vector light connected two-point correlation functions and derived physical quantities in the mixed action lattice setup adopted by ETM collaboration. We focus on preliminary results of the computation within isospin symmetric QCD (isoQCD) of the R-ratio smeared with Gaussian kernels of widths down to σ∼250 MeV, which is enough to appreciate the ρ resonance around 770 MeV, using the Hansen-Lupo-Tantatlo (HLT) spectral-density reconstruction method.
@article{arxiv.2502.03187,
title = {Smeared $R$-ratio in isospin symmetric QCD with Low Mode Averaging},
author = {Simone Bacchio and Alessandro De Santis and Antonio Evangelista and Roberto Frezzotti and Giuseppe Gagliardi and Marco Garofalo and Francesca Margari and Ferenc Pittler and Francesco Sanfilippo and Christian Schneider and Nazario Tantalo},
journal= {arXiv preprint arXiv:2502.03187},
year = {2025}
}