6533b870fe1ef96bd12cfda1
RESEARCH PRODUCT
High-precision calculation of the strange nucleon electromagnetic form factors
Stefan MeinelStefan MeinelStefan KriegStefan KriegAndrew PochinskyKostas OrginosKostas OrginosJohn W. NegeleJeremy GreenMichael EngelhardtSergey SyritsynJesse Laeuchlisubject
Quantum chromodynamicsPhysicsNuclear and High Energy PhysicsParticle physicsMagnetic momentNuclear Theory010308 nuclear & particles physicsScatteringLattice field theoryHigh Energy Physics - Lattice (hep-lat)FOS: Physical sciencesLattice QCDStrangeness01 natural sciencesNuclear Theory (nucl-th)High Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)High Energy Physics - LatticeLattice (order)0103 physical sciencesddc:530010306 general physicsNucleonNuclear Experimentdescription
We report a direct lattice QCD calculation of the strange nucleon electromagnetic form factors $G_E^s$ and $G_M^s$ in the kinematic range $0 \leq Q^2 \lesssim 1.2\: {\rm GeV}^2$. For the first time, both $G_E^s$ and $G_M^s$ are shown to be nonzero with high significance. This work uses closer-to-physical lattice parameters than previous calculations, and achieves an unprecedented statistical precision by implementing a recently proposed variance reduction technique called hierarchical probing. We perform model-independent fits of the form factor shapes using the $z$-expansion and determine the strange electric and magnetic radii and magnetic moment. We compare our results to parity-violating electron-proton scattering data and to other theoretical studies.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-05-07 |