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Type: Journal article
Title: SU(3) breaking in hyperon transition vector form factors
Author: Shanahan, P.
Cooke, A.
Horsley, R.
Nakamura, Y.
Rakow, P.
Schierholz, G.
Thomas, A.
Young, R.
Zanotti, J.
Citation: Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015; 92(7):074029-1-074029-11
Publisher: American Physical Society
Issue Date: 2015
ISSN: 1550-7998
Statement of
P. E. Shanahan, A. N. Cooke, R. Horsley, Y. Nakamura, P. E. L. Rakow, G. Schierholz, A. W. Thomas, R. D. Young and J. M. Zanotti
Abstract: 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 regularization. Both octet and decuplet degrees of freedom are included. We formulate a chiral expansion at the kinematic point Q²=−(Mʙ₁−Mʙ₂)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 toward the precise determination of |Vus| from hyperon semileptonic decays.
Rights: © 2015 American Physical Society
RMID: 0030038345
DOI: 10.1103/PhysRevD.92.074029
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Appears in Collections:Physics publications

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