6533b85dfe1ef96bd12be97f
RESEARCH PRODUCT
The pion quasiparticle in the low-temperature phase of QCD
Anthony FrancisHarvey B. MeyerBastian B. BrandtDaniel Robainasubject
PhysicsQuantum chromodynamicsNuclear and High Energy PhysicsParticle physicsNuclear TheoryThermal quantum field theoryHigh Energy Physics::LatticeHigh Energy Physics - Lattice (hep-lat)Charge densityFOS: Physical sciencesNuclear Theory (nucl-th)High Energy Physics - PhenomenologyHigh Energy Physics - LatticePionHigh Energy Physics - Phenomenology (hep-ph)Dispersion relationQuantum electrodynamicsLattice (order)QuasiparticleEffective field theorydescription
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, by contrast with the static screening mass, which increases with temperature. By a simple argument, near the chiral limit the two masses are expected to determine the quasiparticle dispersion relation. 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-09-21 |