SU(3) breaking in hyperon transition vector form factors

P. E. Shanahan*, A. N. Cooke, R. Horsley, Y. Nakamura, P. E. L. Rakow, G. Schierholz, A. W. Thomas, R. D. Young, J. M. Zanotti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We present a calculation of the SU(3)-breaking corrections to the hyperon transition vector form factors to O(p(4)) in heavy-baryon chiral perturbation theory with finite-range regularization. Both octet and decuplet degrees of freedom are included. We formulate a chiral expansion at the kinematic point Q(2) = -(M-B1-M-B2)(2), which can be conveniently accessed in lattice QCD. The two unknown low-energy lconstants at this point are constrained by lattice QCD simulation results for the Sigma(-) -> n and Xi(0) -> Sigma(+) transition form factors. Hence, we determine lattice-informed values of f(1) at the physical point. This work constitutes progress toward the precise determination of vertical bar V-us vertical bar from hyperon semileptonic decays.

Original languageEnglish
Article number074029
Number of pages11
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
Publication statusPublished - 21 Oct 2015


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