The pion quasiparticle in the low-temperature phase of QCD
Abstract
We investigate the properties of the pion quasiparticle in the low-temperature phase of two-flavor QCD on the lattice with support from chiral effective theory. We find that the pion quasiparticle mass is significantly reduced compared to its value in the vacuum, in contrast to the static screening mass, which increases with temperature. By a simple argument, the two masses are expected to determine the quasiparticle dispersion relation near the chiral limit. Analyzing two-point functions of the axial charge density at non-vanishing spatial momentum, we find that the predicted dispersion relation and the residue of the pion pole are simultaneously consistent with the lattice data at low momentum. The test, based on fits to the correlation functions, is confirmed by a second analysis using the Backus-Gilbert method.
Keywords
Cite
@article{arxiv.1509.06241,
title = {The pion quasiparticle in the low-temperature phase of QCD},
author = {Bastian B. Brandt and Anthony Francis and Harvey B. Meyer and Daniel Robaina},
journal= {arXiv preprint arXiv:1509.06241},
year = {2015}
}
Comments
7 pages, 3 figures, talk presented at the 8th International Workshop on Chiral Dynamics, 29 June - 03 July, 2015 Pisa (Italy)