6533b82efe1ef96bd12930b6
RESEARCH PRODUCT
THE NUCLEON MASS AND PION-NUCLEON SIGMA TERM FROM A CHIRAL ANALYSIS OF Nf = 2 + 1 LATTICE QCD WORLD DATA
T. LedwigM. J. Vicente VacasJ. Martin-camalichL. Alvarez-rusosubject
PhysicsParticle physicsChiral perturbation theory010308 nuclear & particles physicsHigh Energy Physics::LatticeDegrees of freedom (physics and chemistry)SigmaLattice QCD01 natural sciencesBaryonPion0103 physical sciencesCovariant transformation010306 general physicsNucleondescription
Fits of the p4 covariant SU(2) baryon chiral perturbation theory to lattice QCD nucleon mass data from several collaborations for 2 and 2+1 flavors are presented. We consider contributions from explicit Δ(1232) degrees of freedom, finite volume and finite spacing corrections. We emphasize here on our Nf = 2 + 1 study. We obtain low-energy constants of natural size that are compatible with the rather linear pion-mass dependence of the nucleon mass observed in lattice QCD. We report a value of σπN = 41(5)(4) MeV in the 2 flavor case and σπN = 52(3)(8) MeV for 2+1 flavors.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-01-01 | International Journal of Modern Physics: Conference Series |