Multi-particle-state contributions to hadronic correlation functions using chiral perturbation theory
Subject Area
Nuclear and Elementary Particle Physics, Quantum Mechanics, Relativity, Fields
Term
from 2016 to 2024
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 313770616
Current and future lattice QCD simulations with physically light pion masses face new challenges. Multi-particle states with one or more pions cause sizable multi-particle-state contaminations in hadronic correlation functions, leading to large systematic uncertainties in the observables computed by numerical simulations. Chiral perturbation theory, the low-energy effective theory for QCD, can be used to compute analytically these multi-particle-state contaminations. In this project we perform these perturbative calculations for various hadronic structure observables (e.g. the axial, pseudoscalar and electromagnetic form factors) and the form factors relevant for semi- leptonic B to pi decays. Our final results can be used to analytically remove the multi-particle-state contaminations for these observables in the analysis of numerical lattice data, thus eliminating an uncertainty that otherwise would result in a systematic error that is hard to quantify.
DFG Programme
Research Grants
