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Chiral extrapolation and finite-volume dependence of the hyperon vector couplings

Li-Sheng Geng1, Kai-Wen Li1, and J. Martin Camalich2,3

  • 1School of Physics and Nuclear Energy Engineering and International Research Center for Particles and Nuclei in the Cosmos, Beihang University, Beijing 100191, China
  • 2Department of Physics, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0319, USA
  • 3PRISMA Cluster of Excellence Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany

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Phys. Rev. D 89, 113007 – Published 30 June, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.113007

Abstract

The hyperon vector form factors at zero momentum transfer, f1(0), play an important role in a precise determination of the Cabibbo-Kobayashi-Maskawa matrix element Vus. 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 nf=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 mπL=4.6, but chiral extrapolation needs to be performed more carefully. Nevertheless, the discrepancy remains, and further studies are needed to fully understand it.

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Phys. Rev. D 89, 113007– Published 30 June, 2014
  • Received 4 March 2014

© 2014 American Physical Society

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