6533b873fe1ef96bd12d5f57
RESEARCH PRODUCT
Fitting strategies to extract the axial charge of the nucleon from lattice QCD
Hartmut WittigGeorg M. Von HippelJ. HuaBenjamin JaegerHarvey B. MeyerThomas Raesubject
QuarkPhysicsParticle physicsCovariance matrixHigh Energy Physics::LatticeOperator (physics)Quantum electrodynamicsEstimatorInverseCharge (physics)Lattice QCDNucleondescription
We report on a comparison of several fit methods used for the extraction of the nucleon axial charge gA from lattice QCD with two dynamical flavours of O(a) improved Wilson quarks. We use plateau fits, summed operator insertions (the summation method) and a new “midpoint” method to investigate contributions from excited states that affect the determination of gA. We also present a method to perform correlated fits when the standard estimator for the inverse of the covariance matrix becomes unstable.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-04-28 | Proceedings of 31st International Symposium on Lattice Field Theory LATTICE 2013 — PoS(LATTICE 2013) |