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|Title:||SU(3) breaking in hyperon transition vector form factors|
|Citation:||Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015; 92(7):074029-1-074029-11|
|Publisher:||American Physical Society|
|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|
|Appears in Collections:||Physics publications|
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