6533b86efe1ef96bd12cc03b
RESEARCH PRODUCT
Chiral extrapolation and finite-volume dependence of the hyperon vector couplings
J. Martin CamalichLi-sheng GengKai-wen Lisubject
PhysicsQuantum chromodynamicsNuclear and High Energy PhysicsParticle physicsChiral perturbation theoryNuclear TheoryCabibbo–Kobayashi–Maskawa matrixHigh Energy Physics::LatticeMomentum transferHigh Energy Physics::PhenomenologyHigh Energy Physics - Lattice (hep-lat)ExtrapolationHyperonFOS: Physical sciences16. Peace & justiceHigh Energy Physics - ExperimentBaryonNuclear Theory (nucl-th)High Energy Physics - PhenomenologyHigh Energy Physics - Experiment (hep-ex)High Energy Physics - LatticeHigh Energy Physics - Phenomenology (hep-ph)Covariant transformationdescription
The hyperon vector form factors at zero momentum transfer, $f_1(0)$, play an important role in a precise determination of the Cabibbo-Kobayashi-Maskawa matrix element $V_{us}$. Recent studies based on lattice chromodynamics (LQCD) simulations and covariant baryon chiral perturbation theory yield contradicting results. In this work, we study chiral extrapolation of and finite-volume corrections to the latest $n_f=2+1$ LQCD simulations. Our results show that finite-volume corrections are relatively small and can be safely ignored at the present LQCD setup of $m_\pi L=4.6$ but chiral extrapolation needs to be performed more carefully. Nevertheless, the discrepancy remains and further studies are needed to fully understand it.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-02-28 |