SU(3) breaking in hyperon transition vector form factors
Shanahan, P. E. · Cooke, A. N. · Horsley, R. · Nakamura, Y. · Rakow, P. E. L. · Schierholz, G. · Thomas, A. W. · Young, R. D. · Zanotti, J. M.
Original · EN
We present a calculation of the SU(3)-breaking corrections to the hyperon transition vector form factors to O(p⁴) in heavy baryon chiral perturbation theory with finite-range regularisation. Both octet and decuplet degrees of freedom are included. We formulate a chiral expansion at the kinematic point Q²=-(MB₁-MB₂)², which can be conveniently accessed in lattice QCD. The two unknown low-energy constants at this point are constrained by lattice QCD simulation results for the Σ-→ n and Ξ⁰→ Σ+ transition form factors. Hence we determine lattice-informed values of f₁ at the physical point. This work constitutes progress towards the precise determination of |Vus| from hyperon semileptonic decays.
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